Ernest rutherford was the first scientist to suggest atoms had a central location where positively charged particles were present.

what do we call this central area of an atom that contains protons?

a. nucleus
b. cloud
c. shell
d. election

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

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

What characteristic makes a cell membrane selectively permeable