What is thought to be a consequence of the increased oxygen (O2) in the atmosphere during and after the Silurian Period?
A. Conquest of land by arthropods.
B. Conquest of land by arthropods and vertebrates.
C. Increases in animal body sizes and conquest of land by plants.
D. Conquest of land by arthropods and vertebrates, and plants.
E. Conquest of land by arthropods and vertebrates and an increase in animal body sizes.
E. Conquest of land by arthropods and vertebrates and an increase in animal body sizes.
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The least mobile protists are the
a. apicomplexans. b. dinoflagellates. c. diatoms. d. heterokonts. e. euglenoids.
In vertebrates, the CNS consists of the
a. brain and spinal cord. b. brain and gray matter. c. spinal cord and gray matter. d. brain and reflexes. e. spinal cord and nerves.
Perhaps a plant's greatest liability is its
inability to a. produce growth hormones. b. use aerobic respiration. c. move when conditions around it deteriorate. d. produce its own lipids and proteins. e. respond to dwindling supplies of nutrients and water.
In a songbird species, defending a territory saved the bird 584 calories a day in reduced foraging activity, but cost the bird 656 calories in defense of the territory. Is defending the territory consistent with the prediction from optimal foraging theory, and what can explain this?
A. Yes, because a bird of this species will minimize predation risk by defending the territory. B. No, but there may be non-nutritional benefits to defending territory. C. No, so it is likely that the researcher made a mistake in data collection. D. No, so that demonstrates that optimal foraging theory is not useful. E. Yes, because the bird will save 72 calories per day due to defending the territory.