No, they don't have organs and organ system.
Cells form tissues, Tissues form organs, Organs forms organ system; Unicellular have their own one cell only. So, it can't possible that they have organs or organ system.
Neurotransmitters that have narcotic-like effects are called endorphins. These neurotransmitters are responsible for our feelings of excitement or satisfaction.
Answer:
Gasoline, paint, radioactive waste, pesticides, mercury, lead oil, and battery acid.
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The answer is B. Gravitational potential energy.
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Brine rejection is a process that occurs when salty water freezes. The salts do not fit in the crystal structure of water ice, so the salt is expelled.
