Since about 1990, the world population has increased by about what percentage? a) 10% b) 100% c) 70% d) 40% i think it's either a or d but i'm not sure

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point