The kidney is considered a major homeostatic organ because it maintains the balance of water, ions, and electrolytes in the blood.
Kidneys extract wastes and excess fluid from the body, kidneys also remove acid that is created by the cells in the body and sustain a healthy equilibrium of salts, water, and minerals like sodium, potassium, calcium, and phosphorus in the blood.
Each kidney consists of almost a million filtering units called nephrons. Every nephron has a filter, called the tubule, and a glomerulus. The nephrons function via a two-step process, the glomerulus purifies the blood, and the tubule returns required substances to the blood and clears wastes.
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All of the above- 1, 2, and 3 These introduce variation into the chromosome or into the zygote and create cells and offspring unique from the parents.
A. Skeletal and muscular
the other three don’t have to do with this type of internal movement though as the abdominal region and internal organs don’t have to do with this, A is the only possible answer