Passive diffusion. they need no help passing
By mass
The liver
In general
The skin
<span>The mountains were once seas. The land was forced up by tectonic motion when the mountains were formed. The Sahara also used to be a sea and has a valley full of the fossilized remains of an extinct species of whale. It is generally agreed upon that two plates colliding caused the uplift that created the mountainous zone. Same for the Himalayas.</span>
Answer:
hey im working on the same thing, i'm also very confused, but the genes preform different functions
I believe its metabolic pathways