Which answer best indicates the dynamic balance of an ecosystem?

space and food vs. temperature and water
number of plants vs. number of animals
number and variety of organisms vs. changing environment
number of organisms vs. constant environment

The correct answer to this question would be c

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