Which part of the heart takes blood from the veins and pumps it into a ventricle?
a. atria
b. valves
c. arteries
d. ventricles

1)some people believe that certain drugs such as marijuana should be legalized. do you agree or disagree? 2)what impact might legalization have on forensic science as a field? which drug presents the greatest challenges to forensic science? why?

Gametes are cells. haploid diploid

During prohase 1 of meiosis crossing over between the sister chromatids occurs