Fitness is the quantitative representation of natural and sexual selection within evolutionary biology. It can be defined either with respect to a genotype or to a phenotype in a given environment.
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Human chorionic gonadotropin (hCG) is secrete by the embryo early in pregnancy to keep the corpus luteum for dying. This positive feedback will maintain the corpus luteum, which secretes Progesterone and Estrogens throughout pregnancy, in order to keep the endometrium well to nourish the embryo/fetus.
Answer:
A.) Smell is a chemical sense.
B.) Odorant molecules dissolve in mucus before stimulating a receptor
C.) Olfactory receptors have hairs on the apical surface that respond to stimuli
Answer:
D. all of these
Explanation:
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<span>This is due to the higher forces needed to pump blood through the systemic circuit (around the body) compared to the pulmonary circuit.</span>
