The set of characteristics provided by Audesirk and Audesirk are: Animals are multicellular. Animals are heterotrophic, obtaining their energy by consuming energy-releasing food substances. Animals typically reproduce sexually. Animals are made up of cells that do not have cell walls.
The answer is C.) Sac. More formally known as the amniotic sac. It's also sometimes called the bag of waters.
Explanation:
oxygen and glucose
carbon dioxide gas, water and ATP.
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