1- beaks
2- evolution
3- share
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➷ The endocrine system is an organ system that works to produce and secrete hormones. It works by producing and secreting hormones that serve many purposes in the human body. For example, the secretion of insulin helps to regulate the level of glucose in the blood.
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Answer: Number 2, aka Solid wastes on land.
Explanation: Bacteria in soil is a natural thing, so it's not polluting the earth. Oxygen in the atmosphere is letting us live, meaning it's not polluting the earth. Fish in rivers is also another natural thing, leaving us with solid wastes on land.
States that in a heterozygote, one trait will conceal the presence of another trait for the same characteristic.
The nervous system communicates through electrical impulses and the communication is very fast. It works in a relay fashion, from point to point comparable to the way the old telephones systems used to work.
The endocrine system communicates by chemical signals via the bloodstream. Hormones are secreted into the blood and extra cellular fluids, then transported to target cells, which must bear a receptor to be able to bind to a specific hormone, and respond.
Hormones are chemical messengers secreted into blood or extracellular fluid that affect the function of other cells.
Endocrine communication is not quite as fast as the nervous system communication
