Answer: arteries carry oxygenated blood away from the heart to the body. Veins carry oxygen-poor blood back from the body to the heart.
A body that does not produce much internal heat
Cold-blooded animals have a higher rate of secondary productivity because their bodies can preserve energy, especially during the hibernation period. W<span>arm-blooded animals, on the contrary, releases more energy in a cold environment. This makes them hunt for more food to gain sufficient biomass and heat.</span>
