The lungs expand and with that you breathe in air as the diaphram contracts and relaxs to cause "breathing"
C is your answer :)
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Trilobites are found worldwide and evolved rapidly, making them easily distinguishable from trilobites of other time periods
The energy before and after a process must be the same.
Plant cells have a cell wall, but animals cells do not. Cell walls provide support and give shape to plants. Plant cells have chloroplasts, but animal cells do not. ... Plant cells usually have one or more large vacuole(s), while animal cells have smaller vacuoles, if any are present.