William Smith and Georges Cuvier
Temperature, viscosity, and amount of dissolved gases
The right side of the heart sends blood out to the lungs to become oxygenated and that oxygen-rich blood comes back to the heart on the left side. Then the left side of the heart pumps the oxygenated blood to the rest of the body.
Used in biology to figure out the genes that may be transferred from parent to child. Although this square doesn't determine the exact genes, it helps predict the chance of the child having particular genes.