A plant's ability to absorb carbon dioxide is reduced when:

A. water is plentiful.
B. temperatures are cold.
C. stomata are closed.
D. the epidermis is lacking.
E. mesophyll cells lack air spaces.


C. stomata are closed.

Biology & Microbiology

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Malpighian tubules are found in

a. annelids. b. mammals. c. flatworms. d. insects. e. larval mollusks.

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Diffusion of materials between the blood and body tissues occurs at which of the following blood vessels?

A. capillaries B. arteries C. veins D. arterioles E. venules

Biology & Microbiology

Which of the following does NOT occur in the first trimester?

a. formation of a heart b. disappearance of the tail c. formation of internal organs d. detection of movement of the fetus e. segmentation and development of somites

Biology & Microbiology

Suppose you have type O blood (genotype ii). To whom can you safely donate blood?

a. to people with type O only b. to people with type A only c. to people with types A, B, and O d. to people with type B only

Biology & Microbiology