The front leg of an iguana and the wing of a bird look different, but both limbs likely evolved from the same limb of a shared ancestor.

structures such as these are said to be
a.
heterogeneous
b.
differentiated
c.
homologous
d.
vestigial

A homologous structure is an organ, system, or body part that shares a common ancestry in multiple organisms. So the Structure is said to be C) Homologous. Hope this Helps

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass

That is false even though water expands when frozen nothing changes at all