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.
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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
Malpighian tubules are found in
a. annelids. b. mammals. c. flatworms. d. insects. e. larval mollusks.
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
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