According to the focus on neuroscience box on the adolescent brain, the amount of gray matter in the brain peaks at about age for girls and age for boys.

11 year in girls and 12 years in boys

Explanation:

The volume of grey matter peaks at the adolescent age of child, however it starts growing since the childhood. It is considered that a girl’s adolescent age starts from 11 years while a boy’s adolescent age starts from 12 years. Thus, grey matter reaches at its peak when  girls reaches the age of 11 years and boy reaches the age of 12 years.

Grey matter starts declining as adulthood is reached in both male and female.

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).