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iragen [17]
3 years ago
9

_____ is a theory stating that the continents had once been joined but then drifted apart.

Biology
2 answers:
irina1246 [14]3 years ago
8 0
That would be B continental drift
attashe74 [19]3 years ago
8 0

Answer:

b

Explanation:

do your research

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I hope this helped! :) Have a nice day!

5 0
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The Ca2+ ions allow synaptic vesicles to move and bind with the presynaptic membrane which is present on the neuron and released neurotransmitter from the vesicles into the synaptic cleft. Once it's released ACh diffusion occurs across the synaptic cleft to the motor end plate, and binds with ACh receptor. As the neurotransmitter ACh binds, these ions channel open and sodium ions cross the membrane into the muscle cells.

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