During the next few million years, their actions caused which of these events?

In order to clone adult animals, scientists typically begin with a(n)

Which direction does the energy flow in this energy pyramid ?

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