Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

The answer is (C) proteins

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after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

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plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.