The exposure of certain types of radiation
Answer:
A. Abrasion
Explanation:
<em>"In abrasion, one rock bumps against another rock. Gravity causes abrasion as a rock tumbles down a mountainside or cliff. Moving water causes abrasion as particles in the water collide and bump against one another."</em>
<em>-Lumen Learning</em>
I am going to have to say algae and fungus.
Hope this helps, if not, comment below please!!!
What he said ^^. . . ....... . .
<h2>
Answer:</h2><h2>
Cells exist by themselves such as bacteria....</h2>
Whilst Virus are non loving infectious particles and need a living host to reproduce.