i have a real important question why is my hair straight but my parents hair is curly just like their parents?¯\(°_o)/¯

Hair isn't fully determined by genetics.

Explanation:

Your hair is usually determined by genes,however there are outside factors such as medicine,hormones,weather,chemicals such as hair relaxers which can effect your or your parents' hair texture. For some people hair texture also changes with age meaning your parents possibly had straight hair when they were younger but due to outside factors it changed.

answer; estimate the number between the highest and lowest number; ///

i think it would be b the increase in body temp