__ respiration is an alternating pattern of slow breathing, the absence of breathing, and rapid breathing

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

The seed coat's most important function is to provide a) a nonstressful environment for the megasporangium. b) the means for dispersal. c) dormancy. d) a nutrient supply for the embryo. e) desiccation resistance.

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