Which type of anatomic structure are bird wings and butterfly wings when compared to each other?
a. vestigial
b. homologous
c. analogous
d. heterologous

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