A blood vessel one cell thick for absorption of nutrients and removal of wastes is

a. a vein.

b. an artery.

c. a capillary.

d. the pulmonary artery.

What 3 pigments are in a carrot? what 3 are in spinach?

What term describes the behavior of an animal which warns another that a predator is approaching

Which is true of the light reaction of photosynthesis? A. It breaks down ATP. B. It breaks down sugar. C. It produces ATP. D. It produces sugar.

Why was it difficult for people to accept a heliocentric concept of the solar system

A scientist is studying a substance that cycled through ecosystems. Which substance might the scientist be studying?

What are the two zones of an aquifer? a.) capillary fringe and water table b.) zone of saturation and zone of unsaturation c.) zone of aeration and zone of unsaturation d.) zone of unsaturation and water table

The only cytoskeletal fibers not associated with intracellular movement or whole cell locomotion are the

The example of the great barrier reef is used to illustrate A-the insignificance of coral reefs B-the lack of diversity in the ecosystem C-the consequences of increasing acidity D-the problems that too much algae can relate

What is found in the air spaces within soil?

What is the cycle involving the movement of carbon through the environment