The example of a biotic factor is the shrimp population in a bay. Biotic factors are living factors that affect organisms in an ecosystem. The biotic factors includes the producers or autotrophs, consumers or heterotrophs, and decomposer. Abiotic factors on the other hand are the non-living factors that influence an ecosystem; they include, sunlight, soil, humidity, etc
Answer:
Adenine and guanine are purines, while thymine, cytosine and uracil are pyrimidines.
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A cell membrane is c.selectively permeable because it regulates what materials enter the cell.
