Guard cells regulate which characteristic of life? A
Every living organism is made of cells.

B
All living things are composed of DNA.

C
All living things grow.

D
All living organisms strive for balance through homeostasis.

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons