Astudy conducted by the national institutes of health on the infectivity of methicillin-resistant staphylococcus aureus (mrsa) stated their hypothesis as

-hails tea

explanation:

-t poses

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

answer/// wohler;