This question isn't really finished, but bacterium are unicellular prokaryote.
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No, there are unicellular organisms or single-celled organisms which have one cell...
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Answer:
B. CO2 out
Explanation:
The excretion is the process of removal of the waste product from the body. The carbon dioxide is the byproduct of the aerobic respiration, which is carries from the tissues and the lungs by blood. In the lungs at alveoli, the carbon dioxide is transferred from the blood to the lungs and released out through the nostrils. Hence, the out of the carbon dioxide represent excretion through lungs.
A phospholipid is a lipid made of a phosphate group with two fatty acids.
A second messenger is a molecule inside cells that acts to transmit signals from a receptor to a target.
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