<span>The following statements explain how oxygen was introduced into the earliest atmosphere of the Earth and how the presence of oxygen affected life on Earth.
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B) Oxygen is needed to carry out many life processes. The addition of oxygen to the earth's atmosphere assisted with the development of eukaryotic organisms.
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D) Photosynthesis was carried out as cyanobacteria evolved. Oxygen is a product of photosynthesis.
<span>An example of an epithelial tissue where gases are exchanged is alveolar epithelium, which can be found in the lungs. This tissue is simple epithelial tissue. This is to be expected because the cell layer needs to be thin enough for the gasses like carbon dioxide and oxygen to diffuse or pass through. Stratified epithelial tissue contains several cell layers that would impair the exchange of gasses.</span>
The cell membrane protects the cell and keeps bad things like viruses from getting in the cell.<span>It consists of the lipid bilayer with embedded proteins.</span>
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Active transport requires energy input from the cell.
Answer:
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Explanation:
