Why is the amniotic egg considered an important evolutionary breakthrough?
A) It has a shell that increases gas exchange.
B) It allows deposition of eggs in a terrestrial environment.
C) It prolongs embryonic development.
D) It provides insulation to conserve heat.
E) It permits internal fertilization to be replaced by external fertilization.
Answer: B
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Biology
- Which era is known as the "age of reptiles"?
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- The swim bladder of ray-finned fishes
- There is evidence that ray-finned fishes evolved
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- Which of these statements accurately describes a similarity between sharks and ray-finned fishes?
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- Which of these might have been observed in the common ancestor of chondrichthyans and osteichthyans?
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- A team of researchers has developed a poison that has proven effective against lamprey larvae in freshwater cultures. The poison is ingested and causes paralysis by detaching segmental muscles from the skeletal elements. The team wants to test the poison's effectiveness in streams feeding Lake Michigan, but one critic worries about potential effects on lancelets, which are similar to lampreys in many ways. Why is this concern misplaced?
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- The feeding mode of the extinct conodonts was
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- Which of the following statements would be least acceptable to most zoologists?
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