If a bacterium could divide into two every 20 how many bacteria would be produced after eight hours?

Why does the skin of your finger shrink when you wash clothes for a long time?

Spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

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