If fertilization occurs which hormone triggers the thickening of the endometrium a. estrogen
b. progesterone

Which of the following is an oxidation-reduction reaction? (pictured below)

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming