Which is a cause of natural selection?

O A. Lack of predators

O B. Unlimited shelter

O C. Stable weather

O D. Limited food

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Nucleic acid certain protein cell membranes certain carbohydrates

This comparative chart is an example of one that might be used by scientists and law enforcement personnel for identification purposes. the chart represents a technological advance called