Answer:
(1) as organic molecules in living and dead organisms found in the biosphere; (2) as the gas carbon dioxide in the atmosphere
Explanation:
The correct answer is eukaryotic cells.
Microscopic subunits within the cell represent the organelles found only in complex eukaryotic cell. The communication between those organelles via signal molecules are also a good example of the functioning of eukaryotic cell.
Eukaryotic cell is a cell that contains a nucleus and organelles, and is enclosed by a plasma membrane.
Your brain sends signals to your body to release hormones that make you tired. This is done as a routine, and trying to sleep at different times will mess it up.
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The statement that is true is C.
