Because identical twins begin as a single fertilized egg that then separates, identical twins, share percent of genetic makeup. A. 100
B. 75
C. 50
D. 25

A. 100%

Explanation:

To make a fertilized egg (a zygote) two gametes must fuse during fertilization.

These gametes are the egg and the sperm. They each have 23 chromosomes. When they fuse, the zygote is a single cell with 46 chromosomes. It then divides and divides to form a developing embryo.

If identical twins form, the developing zygote splits into two individuals. However, they still came from exactly the same starting cell made by the same sperm and egg, so they share 100% of the DNA

A. 100%

Explanation:

Quizlet says so

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.