How many gene pairs are needed to affect skin color?

 At least four pairs of alleles are involved in skin color, and there are nine (or more) shades of skin color. The bionomial expansion (a + b)6 can also be used to display the cross in Table 1, where the letter a represents the number of capital letters and the letter b represents the number of small case letters.

Explanation:

chemical because it warmed up which involves temperature and it bubbled which includes changing

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well we can't tell you because we cant see the time give a screen shot or something.