Which statement best describes why pathogens are harmful?
1. all of the cells of an organism infected by pathogens become pathogens.
2. pathogens cannot be controlled once they enter the cells of an organism.
3. pathogens produce antibodies that kill the host organism.
4. pathogens can interfere with normal life functions.

the answer is 100% density i've answered this question before and done the quiz myself.

high growth (apex)

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101