When are acids used in the human body?

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

Ture or false evidence for evolution includes millions of fossils

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