The purpose of selective breeding is to

The purpose of selective breeding is to develop livestock whose desirable traits have strong heritable components and can therefore be propagated

You can create or develop livestock whose traits have strong heritable components and can therefore create the specific breed.

Explanation:

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

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