The heart is made of muscle and haschambers, on each side. The left side containsblood and the right side containsblood. The wall of the left ventricle isthan the wall of the right ventricle because it has to pump blood to the. Deoxygenated blood from the body enters the heart through thebringing blood from the top of the body andbringing blood from the bottom of the body. From there it passes through theand through theinto the. It then flows through theto the lungs where it receives oxygen. Oxygenated blood then flows black through theinto the . It then flows through theinto theand out through thevalve into theto the rest of the body. Arteries carry bloodfrom the heart while veins carry bloodthe heart. The blood in arteries iswhile in veins, the blood is. One exception to this rule is theand.

The right side of your heart receives oxygen-poor blood from your veins and pumps it to your lungs, where it picks up oxygen and gets rid of carbon dioxide. The left side of your heart receives oxygen-rich blood from your lungs and pumps it through your arteries to the rest of your body.

Explanation:The right side of your heart receives oxygen-poor blood from your veins and pumps it to your lungs, where it picks up oxygen and gets rid of carbon dioxide. The left side of your heart receives oxygen-rich blood from your lungs and pumps it through your arteries to the rest of your body.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: