The stronger survived and the weaker passed on... Those with a weaker immune system had trouble with sickness and usually ended up passing on but those with strong immune systems were stronger and healthier and lived.
Answer:
A
Explanation:
it will break down to co2 which is absorbed in the body to form glucose to release energy
Females have two X chromosomes while males have one X and one Y chromosome
The circulatory system - hemoglobin in the blood transports oxygen :)
Plate tectonics and the ocean floor. ... Where plates are pulled away (diverge) from each other molten magma flows upward between the plates forming mid-ocean ridges, underwater volcanoes, hydrothermal vents, and new ocean floor crust. The Mid-Atlantic Ridge, is an example of this type of plate boundary.
