These sources of information are used to determine the relationships among different species. which provides information at the species level? comparison of fossil records comparison of the nucleotide sequences in dna comparison of the morphology of the different species

Only "comparison of fossil records" would give accurate information regarding the relationships between different species, because these changes take hundreds of thousands of years to occur. 

No they’ve not done that

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