i need hhelp on these last two questions(what is the realationship between the height of villi and absorption ?) and (As villi get taller the increases because...) thank you :)

not: both offer magnification to the atomic level.

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