An enzyme is which of the following?

a- an acid
b- an amino nucleotide
c- a biological catalyst
d- an atom

Did you know that a blue wales tongue weighs more than an elephant?

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

Idon’t understand this can someone give me the answer? you