3 interesting facts about down syndrome

There are three different types

In the U.S, black or African American infants with Down syndrome have a lower chance of surviving beyond their first year of life than other races

There are more than 400,000 people living with Down syndrome in the U.S

Explanation:

[content deleted] - user123802726recklesschicken

not sure if this what   you'r looking for would be percent composition