Because Evolution, theory in biology postulating that the various types of plants, animals, and other living things on Earth have their origin in other preexisting types and that the distinguishable differences are due to modifications in successive generations
Coyotes- omnivores, vultures- scavengers, cattle- herbivores, alligators- carnivores
The expression of genes in an organism can be influenced by the environment, adding the external world in which the organism is or where it develops, as well as the organism's internal world, which includes such factors as its hormones and metabolism.
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When an individual's cortisol levels are low, such as in the case of people with Addison's disease, the hypothalamus region of the brain releases corticotrophin-releasing hormones. This causes the pituitary gland to also secrete another hormone called, adenocortocotropic hormone into the bloodstream. <span>When the adrenal glands detect these hormones, they secrete cortisol, causing blood levels of cortisol to rise.</span>
