Guys i have a test in 20 minutes about cells from bacteria, animals, and plants. Please give me some tips because this is a HUGE test and im VERY stressed out.

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

Amap's orientation is typically determined by an