The answer is a low-density particle
B, because as energy is move up form the phyramid, energy is lost.
Answer:
They can move about freely.
They can reproduce.
They can respond to internal stimulus.
The answer would be C.
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The answer is the cell membrane. The cell membrane controls what nutrients come in, and what unneeded material comes out. It protects the cell from anything that might come in and harm it. It is kind of like the security guard. A security guard let's the good people in and keeps the bad people out.