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melomori [17]
3 years ago
8

Cephalization is (a) the division of the trunk into a scolex, neck, and body. (b) the presence of a head with sense organs. (c)

sexual reproduction involving self-fertilization. (d) the ability to replace lost body parts. 2. Flatworms (a) are radially symmetrical. (b) possess a body cavity. (c) reproduce by parthenogenesis. (d) have tissues derived
Biology
1 answer:
yarga [219]3 years ago
4 0

Answer:

1. a

2. d

Explanation:

Thats the answer

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I hope this helped.

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Explanation:

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Finally, the chemical messenger is ______________ back into the presynaptic neuron, ready to be used again. As levels of the neu
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Answer:

Finally, the chemical messenger is taken back into the presynaptic neuron, ready to be used again. As levels of the neurotransmitter in the synapse decrease, the stimulation of the postsynaptic nerve ends.

Explanation:

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      An action potential causes the release of neurotransmitters from the presynaptic neuron; if there are enough of these specific neurotransmitters to bind to receptors on the postsynaptic neuron, they do and an action potential is now generated on this neuron.

     This communication between two neurons must end once it's happened. In order for it to end, the synapse must be free of neurotransmitters. One mechanism to do so is for the neurotransmitters to be taken back into the presynaptic neuron.

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Relationship between dna rna condons amino acids and proteins
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How does sugar affect immune system biology?
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