Answer:
An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom's nucleus may result from an excess of either neutrons or protons.
Explanation:
Answer:
The Atmosphere.
Explanation:
The atmosphere that surrounds Earth is made up of gases like nitrogen, carbon, oxygen, and water vapors.
Answer : True
Enrichment cultures are used to increase a small number of desired organisms
