How do limited resources affect evolution of a species?

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

What is the most important inorganic material for livings things? ! due tomorrow!

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?