In ecology and Earth science, a biogeochemical cycle or substance turnover or cycling of substances is a pathway by which a chemical substance moves through biotic (biosphere) and abiotic (lithosphere, atmosphere, and hydrosphere) compartments of Earth.
They are called biogeochemical cycles because chemical substances are cycled through the geosphere and these cycles often involve living organisms.
Matter moves round the ecosystem in certain cycles. The cycles in nature are; water cycle, nitrogen cycle, oxygen cycle, phosphorus cycle, carbon cycle, etc.
Many of these cycles involves living organisms. The substances that are being cycled are chemical substances and the geosphere is involved in all these cycles.
As a result of all these, the cycles in nature are called biogeochemical cycles.
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ASAP HELP
This Saudi Arabian man was the organizer of the September 11th attacks and was the head of the Al-Qaeda terrorist group.
Suggest why there are fewer shire horses today
Final answer:
The decline in the number of shire horses today can be attributed to the mechanization of farming, urbanization, and the preference for other horse breeds.
Explanation:
The decline in the number of shire horses today can be attributed to several factors. One reason is the mechanization of farming, which has reduced the need for horses in agricultural work. Additionally, the shift towards more urbanized areas has led to a decline in demand for horses in transportation. Lastly, the breeding of other horse breeds that are better suited for specific tasks, such as racing or show jumping, has reduced the popularity and population of shire horses.
6 steps of photosynthesis
Why did Mendeleev leave blank spaces in his version of the periodic table? A. Mendeleev’s periodic table arranged elements in order of increasing atomic mass; spaces were left for elements not having the correct atomic mass. B. Mendeleev’s periodic table arranged elements in groups of similar chemical properties; spaces were left for elements not having a similar chemical property. C. Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. D. Mendeleev predicted an element had not been discovered to fit the space.
Answer:
the answer is D
Explanation:
Mendeleev left blank spaces in his version of the periodic table for elements he predicted would be discovered, based on the periodic trends and properties of known elements.
Explanation:Dmitri Mendeleev, a Russian chemist, created his version of the periodic table by organizing elements by increasing atomic mass. However, he intentionally left blank spaces for undiscovered elements that he predicted would fill those gaps. This insightful approach allowed the inclusion of elements that were not yet known, but could be predicted to exist based on the periodic trends he observed in the properties of the elements that were already discovered. Answer D correctly reflects Mendeleev's reasoning: he believed that the periodicity of the table suggested the existence of elements that would be discovered to fit these gaps, and he made predictions about their properties.
Photosynthesis. We know several things about this process. First, it is driven by light, usually sunlight. It is preformed by autotrophs in an ecosystem, and we usually think of plants in this regard. Now think of Earth as a closed system to energy. Sunlight reaches both sides of the lake in this picture but under different circumstances. On the left, there are dark clouds and rain, water in the atmosphere. On the right, it is sunny with cumulous clouds that are not rain clouds or dark
When cars age or are poorly maintained, they tend to leak oil onto the roadways and parking lots. This oil is washed into the nearest waterway with the next rainfall. What type of water pollution does this cause
The oil leaks from poorly maintained or aged cars result in water pollution once this oil enters water bodies. The oil creates a surface layer, blocking light and oxygen, impacting the lives of aquatic organisms. Over time, this type of pollution can pose serious risks to the health of humans and other terrestrial animals consuming this polluted water.
Explanation:When cars age or are poorly maintained and leak oil onto the road, this introduces contaminants into an environment when it enters waterways. This kind of pollution is termed as water pollution. The contamination brought about by oil is a particularly serious form of water pollution due to the oil's effects when it enters a body of water.
As the oil has lower density than water, it rises to the surface and can create large coverings known as oil slicks. This creates zones that block light and oxygen from entering the water bodies, leading to harmful effects to aquatic life including the death of phytoplankton and reduced mobility in marine animals. Additionally, oil pollution can also trigger a phenomenon known as eutrophication, a condition in water where increased nitrogen and phosphorus compounds lead to overgrowth and subsequent death of aquatic algae. The contaminated water can also negatively impact the health of humans and other land animals that consume this polluted water through the food chain.
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Aging or poorly maintained cars can cause non-point source pollution by leaking oil onto roads, which is then washed into waterways, contaminating them with harmful organic chemicals.
When cars age or are poorly maintained, they can leak oil onto roadways and parking lots, leading to a form of water pollution known as non-point source pollution. This type of pollution occurs when rainfall washes oil and other pollutants into waterways, which can contaminate water supplies and harm aquatic ecosystems. Common organic chemicals from automotive fluids include gasoline, oil compounds such as octane and nonane, methanol, and ethanol. All of these contribute to water contamination and can have serious impacts on human health and the environment.
What is the layer of the sun through which energy is transferred away from the core by radiation
Water (H2O) Is composed of the same elements as hydrogen (H2O2) How do their properties compare
How does the structure of a red blood cell help carry out it’s function?
Red blood cells' structure, having a biconcave shape and lacking organelles, maximize their capacity to transport gases. Hemoglobin within these cells bind and transport oxygen and carbon dioxide. Their structural adaptations, like lacking mitochondria, enhances oxygen transport efficiency.
Explanation:The unique structure of a red blood cell enables it to efficiently carry out its primary function, which is gas transport. Red blood cells, also known as erythrocytes, are biconcave discs. This shape provides a greater surface area to volume ratio, which facilitates efficient exchange of oxygen and carbon dioxide.
Erythrocytes are packed with an iron-containing protein called hemoglobin. Each molecule of hemoglobin can bind with four molecules of oxygen, allowing each red blood cell to carry approximately a billion molecules of oxygen. Hemoglobin also helps in carbon dioxide transport.
Red blood cells lack most organelles, providing more room for hemoglobin molecules. Moreover, they lack mitochondria which prevents the use of the carried oxygen for metabolic respiration. These structural adaptations enhance the efficiency of oxygen transport.
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In the drawing, why do the oxygen atoms look different from the hydrogen atoms?
In a drawing of a molecule, the oxygen atoms may look different from the hydrogen atoms due to the simplified drawing method and the difference in electronegativity.
Explanation:In a drawing of a molecule, such as water (H2O), the oxygen atoms may look different from the hydrogen atoms due to two main reasons:
First, organic chemists use a simplified drawing method called a skeletal structure, where hydrogen atoms attached to carbon are not drawn.Second, the difference in electronegativity between oxygen and hydrogen causes a partial negative charge near the oxygen atoms and a partial positive charge near the hydrogen atoms.These differences in representation help simplify the drawing and highlight the charge distribution within the water molecule.
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which statement best defines a cell
ASAP PLZ!!!!! which of these organisms is most likely 50 meters in size?
A.bacteria
B.tree
C.lizard
D.ant
This type of physical weathering occurs in places where there is a large change in daily temperatures, and it can lead to the significant stress on the outer layers of the rocks.
the answer to the question is thermal expansion
Question 4 (2 points) Question 4 Unsaved How can plants protect themselves? A.They produce salicylic acid. B.They become acidic. C. They release toxins. D.All of the above
the correct answer is d.all of above
in fall and winter the amount of sunlight the plants receive decreases. how does this affect photosynthesis
How is a lily leaf cell different from a cats skin cell
Where is your food likely to be two hours after you eat?
What are the 6 steps of photosynthesis
What is one major function of the endomembrane system? producing and storing energy, transporting subtances in a cell, manufacturing proteins,directing the cells activites
What Best describes the advantage of using the model of a food web?
1. Shows feeding connections
2. Explains every detail of wildlife
3. Shows a complex mental model
4. Represents data collected from space
Answer:
Shows feeding connectionsExplanation:
A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community. Another name for food web is consumer-resource system
an example below ( picture of a food web )
Divide 3152 by 3.2 A) 98.5 B) 109.75 C) 985 Eliminate D) 1097.5
how would the ecosystem be affected if your top predators were hunted to extinction
Of the biomes listed below, which receives more annual precipitation than the others?A.desertB.arctic tundraC.temperate rainforestD.temperate grassland
What are three drawbacks of alternative sources of fossil fuels?
List two important groups of organisms that appeared during each of the three most recent geologic eras
Why are pressurized seeds and spores a beneficial adaptation for these plants and fungi?
Fungi and plants are reproducing organisms, which transmit the genetic information from the parent to offspring meiotically or mitotically.
How are pressurized seeds and spores beneficial for fungi?
The spores are the microscopic reproducing agents of the fungi. These spores can be mitotically or meiotically produced depending on the environmental conditions. The spores are burst open in the environment to reach far distances so that they can avoid any competition for resources and light. For instance, if a horse feeds on the spores, the life cycle of the fungi is continued.
Thus, the spores are the reproductive agents of fungi that help in the survival of fungi in different environmental conditions.
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Which is evidence that supports the dynamo theory
Answer: The earth's core is dominantly composed of nickel and iron. Outer core is liquid and inner core is solid.
The liquid present in the outer core moves continuously over the much denser solid inner core, acting as electrically conductive medium. Due to this a magnetic field is produced, which develops a magnetosphere that obstructs the incoming solar radiations from the sun.
Thus the outer liquid core helps us in understanding the dynamo theory.
what do the cell membrane and cell wall have in common with each other? what is their structure?
Choose the correct order of events in the Kreb's cycle:
Citric acid is formed, 4-carbon molecule rearranged, pyruvate is split
Pyruvate is split, citric acid is formed, coenzyme A is added
Pyruvate is split, citric acid is formed, 4 carbon molecule rearranged
Coenzyme A is added, pyruvate is split, citric acid is formed
The correct sequence in the Krebs cycle is adding Coenzyme A to pyruvate, splitting the pyruvate to form acetyl CoA, then combining acetyl CoA with oxaloacetate to form citric acid.
Explanation:The correct order of events in Kreb's cycle is: Coenzyme A is added, pyruvate is split, and citric acid is formed. This sequence can be defined through the following steps:
Pyruvate, produced from glycolysis, enters the mitochondrial matrix.Pyruvate is converted into a two-carbon acetyl coenzyme A (acetyl CoA) molecule by the enzyme pyruvate dehydrogenase. This process involves the addition of coenzyme A to pyruvate, releasing a molecule of carbon dioxide.Acetyl CoA then enters the Krebs cycle by combining with a four-carbon molecule, oxaloacetate, to form a six-carbon citrate molecule, also known as citric acid.Citric acid goes through a series of reactions that reorganize and oxidize it, eventually regenerating oxaloacetate and producing ATP, NADH, and FADH2.Therefore, the statement 'Coenzyme A is added, pyruvate is split, citric acid is formed' is the correct order of events at the beginning of the Krebs cycle.
Final answer:
The correct sequence for the Krebs cycle begins with coenzyme A being added to pyruvate, then pyruvate splitting to form acetyl CoA, and finally, the acetyl CoA combining with oxaloacetate to form citric acid.
Explanation:
The correct order of events in the Krebs cycle is as follows:
Coenzyme A is added to pyruvate, which is split apart, forming a two-carbon acetyl CoA molecule and releasing carbon dioxide.The acetyl CoA molecule enters the Krebs cycle by combining with a four-carbon molecule, oxaloacetate, to form a six-carbon molecule called citric acid (citrate).The citric acid is then rearranged and oxidized, which leads to the production of NADH, and through a series of further reactions within the cycle, more NADH, FADH2, and ATP are produced.The step of the acetyl CoA combining with oxaloacetate to form citric acid is crucial because it initiates the citric acid cycle, and the combined molecule then undergoes the series of chemical transformations in the cycle.
Therefore, the option 'Coenzyme A is added, pyruvate is split, citric acid is formed' is the correct order of events in the Krebs cycle.
One group of students is investigating the cause of the unusual color of water in wells of a location. They analyze the land surfaces and gather data about the locations of the polluted wells. What should be done to ensure that their results are reliable and valid?
To ensure reliable and valid results in investigating the unusual color of water in wells, students should analyze land surfaces, gather data on polluted wells, and conduct multiple water sample analyses.
Explanation:To ensure that the results of the investigation on the unusual color of water in wells are reliable and valid, the students should:
Conduct a thorough analysis of the land surfaces to identify potential sources of pollution, such as nearby factories or agricultural activities.Gather data on the locations of the polluted wells, including the distance from potential pollution sources and the depth of the wells.Take multiple water samples from the polluted wells and analyze them for various parameters, such as pH levels, presence of contaminants, and concentration of pollutants.Compare the data collected from the polluted wells with data from nearby clean wells to establish a baseline and determine the extent of contamination.Repeat the sampling and analysis process multiple times to ensure the consistency and accuracy of the results.