The carbon cycle revolves around
A. nitrogen.
B. water.
C. phosphorus.
D. carbon dioxide.
D. carbon dioxide.
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In a tube-within-a-tube body plan, what forms the outer tube?
a. the body wall b. the wall of the gastrovascular cavity c. the vacuolar membrane d. the intestinal wall e. the gizzard wall.
__________cells function when dead
A. Parenchyma B. Sclerenchyma C. Collenchyma D. Phloem
At the G2-to-M checkpoint, one of the cyclins has reached a concentration great enough to complex with one of the CDKs to initiate DNA synthesis. Which cyclin and which CDK are the ones involved?
a. cyclin M and CDK1 b. cyclin S and CDK1 c. cyclin M and CDK2 d. cyclin S and CDK2
Habitats with many edges
A) are the result of natural disasters. B) favor animals that prefer interior, forest habitat. C) often result from human activities. D) result in a significant increase in ecotourism.