The MOST important populations in an ecosystem are the A
first-order consumers and second-order consumers
B.
producers and consumers
С
decomposers and producers
D
consumers and decomposers
O

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

Nine months old i think but i’m not that sure