The level of organization that encompasses all regions of Earth’s crust, waters, and atmosphere in which organisms

live is known as ____.



a. the biosphere
b. a community
c. an ecosystem
d. a population
e. an organism’s habitat


ANSWER: a

Biology & Microbiology

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Within a single neuron, the direction an impulse follows is

a. dendrite >>> axon >>> cell body. b. axon >>> dendrite >>> cell body. c. dendrite >>> cell body >>> axon. d. cell body >>> dendrite >>> axon. e. cell body >>> axon >>> dendrite.

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All chordates have pharyngeal gill slits at some point during their development

Indicate whether the statement is true or false

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