Evolution of a species could occur as a result of

changes in the

(1) DNA in muscle cells

(2) base sequences in liver cells

(3) genes in an egg cell

(4) number of chromosomes in a fetal bone cell

Evolution of a species could occur as a result of changes in the DNA in muscle cells.

(1) DNA in muscle cells or (3) genes in an egg cell are probably the answers, because these changes, called mutations, can produce qualities of an animal that can either better inhabit the animal in their environment or inhibit the animal from surviving.