As an environment changes, and some organisms have a higher fitness than others, natural selection acts directly on a. existing variations.
b. genetic material.
c. acquired traits.
d. individual organisms.

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.

Which of the following statements accurately defines epidermis? a. a thick protein fiber composed of the protein collagen b. hard, dense bone tissue found on the outer surface of a bone c. single layer of epithelial cells and the underlying basal lamina d. outer, protective layer of the skin composed of stratified squamous keratinized epithelial tissue

What is a food chain? a.different animals located in different communities b. energy transferred from the sun to plants and then to a series of living things c. rows of crops, such as lettuce, in a field d.animals using one another as food for energy and growth