Aprocess in which substances are transported across a plasma membrane with the concentration gradient with he aid of carrier (transport proteins; does no require the use of energy.

9. wind power creates pollution. water air soil noise

Which represents a negative impact of technology

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of