I don't know maybe it is a white blood cell
Its basically saying something (object) at rest is going to stay there until something moves it like an outside object.
Answer:
You take any of the "signs of change in populations of organisms and their environments". For imagine, Australopithecus (early man) turning to Homo sapiens. In that way they could tell that you took this journey.
Increasing water vapor leads to warmer temperatures, which causes more water vapor to be absorbed into the air. Warming and water absorption increase in a spiraling cycle. Hope it helps!
I think the answer is D but it's been a while since I've done this.
