Which of the following are part of the body’s first line of defense against pathogens?

a. white blood cells

b. red blood cells

c. lymph nodes

d. mucous membranes

Leila has dimples because she received a gene copy from her father that coded for dimples. this means that dimples are an example of a trait that is

Twind is considered to be an abiotic factor because it.?

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.