What factor is most important in the cell differentiation that occurs during the metamorphosis of a tadpole into a frog A. the frequency with which females are able to reproduce

B. the expression of different genes at different times

C. the variation in temperature at a given time of year

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

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.

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line