carbon cycle
Explanation:
It is because it moves carbon,a life sustaining element from the atmosphere and oceans into the organisms
Equilibrium is when the sum of the forces is zero.
(BIRDS)
were the first they had feet the wings
An answer might be - <span>Any of a group of complex organic macromolecules that contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur and are composed of one or more chains of amino acids. Proteins are fundamental components of all living cells and include many substances, such as enzymes, hormones, and antibodies, that are necessary for the proper functioning of an organism. They are essential in the diet of animals for the growth and repair of tissue and can be obtained from foods such as meat, fish, eggs, milk, and legumes.
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Answer: It distributes oxygenated blood to the different tissues, it has to be wide enough to fit everything through as efficiently as it can.
essentially its like a tunnel and tunnels have to be wide to fit everything through
