There are different levels of the atmosphere due to differences in... a.) temperature
b.) pressure
c.) molecules
d.) all the above​

Amniocentesis is a process in which amniotic fluid is taken from the mother's womb to identify any genetic abnormalities in the fetus. how would the discovery of the human genome contribute to this process?

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

How many autosomes are in this human karyotype? how many sex chromosomes?