The Respiratory System The Lung Association of Saskatchewan © The respiratory system is what we use to breathe. It may seem simple to breathe, but it’s.
THE DIGESTIVE SYSTEM. as heterotrophs we need to take in our food from the outside once inside the cell, the nutrients are used as scaffolding for synthesis.
THE DIGESTIVE SYSTEM. Evolution of digestion Amoeba – engulfs food, lysomes Hydra – digestive sack with single opening Earthworm/bird – pharynx, esophagus,
