Which characteristic is common to both segmented worms and flatworms? A. Segmented body
B. Front end and a back end
C. Long slender round body
D. A flat body

C. Long slender round body

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