<span>i think it is a.Molecules move against their concentration gradient. hope it helps
</span>
<span>Cellulose is a lot stronger than starch. Starch is practically
useless
as a material, but celluose is strong enough to make fibers from, and
hence rope, clothing, etc. Cellulose doesn't dissolve in water the way
starch will, and doesn't break down as easily.
</span>Your body contains
enzymes that break starch down into glucose to fuel your body. But
we humans don't have enzymes that can break down cellulose.
1 condensation 2 precipitation 3 runoff 4 evaporation.
A dog's sense of smell has improved since being domesticated because C) Humans have bred them to have a strong sense of smell.
