In a pedigree, squares are and circles are . Fully shaded circles and squares represent . Half-shaded circle represents a .

hope this helps

Explanation:

In a pedigree,a circle represents a female. A square represents a male.Half-shaded circle or square indicates that a person is a carrier of the trait. A completely shaded circle or square indicates that a person expresses the trait.

i'd say that the moon rock is about 2.2 billion years old.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.