:an example of a communicable disease is:
a) cancer.
b) chronic respiratory disease.
c) diabetes.
d) giardiasis.

What percentage of light hits earth's surface directly?

Acell goes through cellular respiration and produces atp which it then uses to move a molecule across the cell membrane. how does the energy in the original glucose molecule change during this process? (2 points)

Ascientific idea becomes valid when it is what?