What releases water, carbon and nitrogen back into the atmosphere

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

The table above shows five different types of chromosomal abnormalities that can occur during meiosis. they result in either an individual having too many or too few chromosomes in their genome. what is the most likely cause of these chromosomal abnormalities?

Agroup of organisms that changes over time is said to