Because no organism lives forever, is necessary in order to prevent extinction of a species.

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Because no organism lives forever, reproduction is necessary in order to prevent the extinction of a species. Reproduction is the process of how a new living is bred and brought into life. 

Reproduction ✅ 

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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