An organism or infectious agent that causes disease is called a(n) . a molecule that can elicit an immune response is called a(n) . proteins that directly attack foreign antigens are . protection against infection requires the ability to recognize substances as nonself. many of the proteins on the surfaces of our cells are encoded by genes that belong to the major complex. a cell that displays a foreign antigen is called an antigen- cell. the human antigens are linked to sugars and form branchlike glycoproteins.

Question 1 of 102 pointswhich best describes adaptive radiation? oa. geographical isolation caused by an adaptationob. biodiversity resulting from few ancestorsoc. a decrease in the rate of speciationd. adaptations that organisms teach each other

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

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.