Which characteristic enabled vertebrates to reproduce on land?
1.amniotic egg
2.dorsal nerve cord
3.endoskeleton
4.notochord
1
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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
The only known eukaryotic-bacterial symbioses are the two that explain the development of the chloroplast and mitochondria
A. true B. false
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.
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