the first living organism on earth was probably a(n) ___ because the fossil remnants indicate a single-celled prokaryote.

Bacteria is the first living organism on earth

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