Down syndrome is a condition in which the individual has which chromosome?
a. 3 copies of chromosome 23
b. 3 copies of chromosome 21
c. lacks chromosome 46
d. has only one chromosome 21

In which way are mercury and venus similar? they both rotate from east to west. they are both small and rocky. they both have thick atmospheres. they both are similar to earth in structure.

What changes the stability of the element

What are the three different shapes or structures shapes or structure of carbon-based molecules?