Calcium homeostasis is defined as the process of regulation calcium ion concentration in blood and interstitial fluid. Hormones that regulate calcium ion level in body are calcitonin and parathyroid hormone.

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

Each nephron is made up of capillaries that form the __ sweat glands bladder glomerulus ureter