Which characteristic enabled vertebrates to reproduce on land?

1.amniotic egg
2.dorsal nerve cord
3.endoskeleton
4.notochord


1

Biology & Microbiology

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Cells with a nucleus are called __________; cells without a nucleus are called __________

A. animals; plants B. prokaryotes; eukaryotes C. eukaryotes; yeast D. bacteria; animals E. eukaryotes; prokaryotes

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The only known eukaryotic-bacterial symbioses are the two that explain the development of the chloroplast and mitochondria

A. true B. false

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All of the following are adaptations against predation in the open ocean except:

a. transparent bodies. b. colorful bodies. c. colonial lifestyles. d. countershading. e. silvery coloration.

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The point at which a nerve impulse is initiated is the ____

a. initiation threshold b. initiation potential c. action potential d. graded potential e. threshold potential

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