What similarities in anatomical structures provide evidence of a link between pangolin and other animals? What additional evidence would help support the claim the the pangolins share a commom ancestor?

Single strand binding protein by peptide bond

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