According to the big bang theory, the universe was once a very and hostile place.

explanation:

the sequence of amino acids in a protein determines its function. the dna sequence of a gene determines the amino acid sequence of the resulting protein. thus, any changes in dna sequence can result in changes in protein function. this is called a mutation.

hi,

the answer is third world countries, take for instance china, they restricted each family with only one child,

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