The word you're looking for is Exoskeleton. The outer covering is called an EXOSKELETON which is a hard covering on the outside of the body that provides both support and protection. The exoskeleton is made of CHITIN. Some exoskeletons are leathery like caterpillars, and some are tough and hard like ticks and crabs.
Human skin cells are eukaryotic.
Prokaryotic cells are unicellular and don't have a nucleus with a membrane. However, human skin cells have both a membrane and are not unicellular.
Reducing the Chemicals dumped into wastewater
The answer to this question is the change in neurotransmitter serotonin. A low level of serotonin can lead to a low mood, depression, and even anxiety. Serotonin is a chemical found in our body that gives / transmits impulses that is regulated to makes a person happy and maintains a mood balance.
Answer:
recieving information about the environment around us. nerve cell
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