Question

About _____ of the variation in age of puberty is determined by genes.

A) one-half.
B) two-thirds.
C) one-fourth.
D) three-fourths.

Answer 1

b : two thirds , hope this helps

Answer 2

B. Two-thirds.

Step-by-step explanation:

About two-thirds of the variation in age of puberty is determined by genes.

Hope this helps!