What two key insights allowed darwin to come up with the therory of natural selection?

The phases of diploid and haploid multicellular plants alternate between generations in their life cycle.

Thus, The chromosomes are copies in diploid and haploid organisms. The plant's spores are unicellular, and when they begin to divide through the process of mitosis, they form identical cells.

These haploid cells are all identical. Each parent's set of chromosomes is present in equal numbers at haploid stages. The gametophytes are multicellular systems made up of these similar cells.

The haploid multicellular stage of a plant's life cycle is known as a gametophyte. Gametes are produced by the gametophyte. The sexual fertilization process is carried out by these gametes.

Thus, The phases of diploid and haploid multicellular plants alternate between generations in their life cycle.

Learn more about Gametes, refer to the link:

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An epidermal layer found only in the skin of the palms of the hands and the soles of the feet is the stratum lucidum.

Our skin has three layers: epidermis, dermis and hypodermis. Each layer is divided into further layers. The outermost layer of the skin epidermis has five layers, stratum lucidum is one of them.

Make an observation

Form a hypothesis

conduct an experiment

analyze the results

Draw a conclusion

The answer is cirrhosis. Cirrhosis builds up when scar tissue changes normal, healthy tissue in your liver. It happens after the healthy cells are damaged over a long period of time. This is a late stage of scarring (fibrosis) of the liver caused by many forms of liver diseases and conditions, such as hepatitis and chronic alcoholism. The liver performs a few essential roles, like cleaning your blood, detoxifying harmful substances in your body, and making vital nutrients.

Ecology is the study of how living organisms interact with each other and their environment. It involves understanding relationships at various scales - from individual organisms to global processes. Ecologists use this knowledge to address real-world problems such as climate change and species conservation.

The study of how living things interact with each other and their environment is called Ecology. It involves understanding the relationships between organisms, populations, communities and ecosystems, and their interaction with the physical environment. This encompasses everything from small-scale interactions, such as predator-prey dynamics, to large-scale global processes like climate change and its effects on global biodiversity.

For instance, an ecologist might study how a forest ecosystem recovers after a wildfire, or how the presence of a particular species affects the other organisms in its habitat. Through the lens of ecology, we can gain insights to help solve real-world problems, including pollution, climate change, and species conservation.

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luminosity of 1, and is Yellow.

Answer:

Yellow

Explanation:

As per the Hertzsprung-Russell diagram, stars which are hot lie on left hand side of the diagram while the stars which are cool lie on the right hand side of the diagram.  

However while moving from top to bottom on HR diagram, bright stars lie at the top while the faint stars ;lie at the bottom of the diagram.  

However Sun is an average star which has mediocre temperature and luminosity and therefore it lies near to the middle of the diagram.

Hence, it is yellow in color

Answer:

The age structure, breeding pattern  and environment are the ultimate causes for balancing a population.

Explanation:

When it comes to balancing a population, the main causes are all kinds of demographic components. The equilibrium of a population is directly linked to the reproducibility of the individuals involved. Based on this, we can say that the age structure and reproductive pattern of individuals are very important demographic components for population balance. In addition, these components are directly linked to the conditions that the environment provides to individuals.

The right answer is C. birds and bats.

There are two types of classification, which present some differences, so they classify the animals differently:

Linnaean classification:

The species (biologically defined by inter-fertility) is the basis of the classification. It is stored in a system of boxes more or less predefined (at least when the outline of the classification are well established).

Reign comprising different branches themselves composed of Classes which group Orders formed of Families composed of Genres in which the species are placed.

If we find a new species (current or fossil), we try to place it in an existing box, taking into account all of its characters. If this is not possible, we create one (or a series of new boxes - new genre - new family ...).

The outline of the classification was drawn before the ideas of evolution, using states of character that a subsequent study recognized as derivatives, but also ancestral states. Groups of the same level (Class for example) can drift from each other.

Cladistic phylogenetic classification:

It is based on the phylogenetic tree. The defined groups are monophyletic: they include a hypothetical ancestor (a node of the tree) and the complete set of his descendants. If one group gives birth to another, it belongs to it and forms a subset.

The advantage is obvious: a perfect match with the most probable scenario of the evolution of the studied group. The disadvantage is the multiplication of nesting levels, already 10 for the vertebrate tree below which is however greatly simplified.

Final answer:

Jamie is in positive nitrogen balance due to his growth needs, where his body uses more protein for tissue development resulting in less nitrogen being excreted.

Explanation:

Considering that three-year-old Jamie is a healthy, active child, his body is in positive nitrogen balance. This occurs because children at this age are growing, which means the body requires more protein to build new tissues. Thus, more of what is consumed, in terms of protein intake, is utilized rather than being excreted. A positive nitrogen balance indicates that the nitrogen consumption is greater than nitrogen excretion, which is typical for a developing child like Jamie.

Amoeba and paramecium share basic eukaryotic structures with plant cells, but plant cells have a large central vacuole, cell wall, and plastids like chloroplasts that these protozoans do not.

The structures in an amoeba and paramecium that also occur in plant cells include a cell membrane, cytoplasm, and sometimes vacuoles, which are common components of eukaryotic cells. However, plant cells have several unique structures not found in these protozoans, such as a large central vacuole, a cell wall, and plastids like chloroplasts. The large central vacuole in plant cells maintains pressure against the cell wall, giving shape and support to the cell, the cell wall provides structure, support, and protection, and plastids such as chloroplasts are involved in photosynthesis and can store pigments.

Final answer:

A lion would share the most similar characteristics with an animal in the same genus, such as other large cats within the genus Panthera like tigers, leopards, and jaguars.

Explanation:

Based on the classification of organisms, a lion would share characteristics most similar to an animal in the same genus. The classification system scientists use, known as the taxonomic classification system established by Carl Linnaeus, organizes living things into hierarchical categories. As you move down these categories from the kingdom to the species level, the organisms become more similar to each other due to shared traits and a closer evolutionary relationship.

Lions, for instance, belong to the genus Panthera, which they share with other large cats like tigers, leopards, and jaguars, which means they are closely related. At the family level, lions are part of the Felidae family, which encompasses all cat-like carnivores, including domestic cats. However, domestic cats belong to a different genus, Felis, indicating that while they share many characteristics and a common evolutionary path, they are less closely related than lions are to other members of the Panthera genus.

Phosphorus is the element not found in abundance in the atmosphere, unlike carbon and nitrogen, which are part of the carbon cycle and naturally occur in the atmospheric gases.

The element phosphorus is not found in abundance in the atmosphere. Unlike carbon, which is part of the carbon cycle and can be found in the atmosphere as carbon dioxide, phosphorus does not have a gaseous phase under normal conditions on Earth. The phosphorus cycle is mainly based on the movement through the lithosphere, hydrosphere, and biosphere, rather than the atmosphere. Phosphorus is essential for life as it is a critical component of bones, teeth, and cellular structures, yet it is relatively rare in the Earth's crust and not readily available in the environment like carbon or nitrogen.

commensalism is the answer

The correct description is b. acinar: alveolar, as both terms describe sac-like structures. Other options mix terms relating to structure and secretion modes.

The correct option is b. acinar: alveolar.

Other pairs do not describe the same characteristic, as explained below:

Understanding these terms helps in recognizing how different glands are classified based on structure and function.

Answer: c. a better explanation might exist

Explanation: