| A | B |
|---|
| Nutrition in Protozoa | Phagocytosis |
| Nutrition in Hydra | Uses tentacles which contain stinging cells, or nemoblasts |
| Nutrition in Earthworm | Digestive system includes mouth, pharynx, esophagus, crop, gizzard, intestine, anus |
| Nutrition in Grasshopper | Digestive system includes mouth, esophagus, crop, gizzard, stomach, intestine, rectum, anus |
| Transport in Protozoa | Diffusion, active transport, cyclosis, contractile vacuole |
| Transport in Hydra | Diffusion, active transport, cyclosis |
| Transport in Earthworm | Closed circulatory system |
| Transport in Grasshopper | Open circulatory system |
| Respiration in Protozoa | Gas exchange through cell membrane |
| Respiration in Hydra | Gas exchange by diffusion between cell membrane and environment |
| Respiration in Earthworm | Skin is the respiratory surface |
| Respiration in Grasshopper | Uses tracheal tubes and spiracles |
| Excretion in Protozoa | WAstes diffuse from cell membrane into watery environment |
| Excretion in Hydra | Diffuse from cell membrane of each cell into watery environment |
| Excretion in Earthworm | Major excretory organ-nephridia |
| Excretion in Grasshopper | Major excretory organ-Malpighian tubules |
| Nervous Regulation in Protozoa | Uses specialized structures called eyespots |
| Nervous Regulation in Hydra | Nerve net |
| Nervous Regulation in Earthworm | USes a brain, ventral nerve cord and ganglia |
| Nervous Regulation in Grasshopper | USes antennae, a brain, ventral nerve cord and ganglia |
| Locomotion in Protozoa | Uses pseudopods, cilia and flagella |
| Locomotion in Hydra | Uses primitive muscle fibers altough it tends to remain in one place |
| Locomotion in Earthworm | Uses two muscle layers and setae |
| Locomotion in Grasshopper | Usesthree pairs of jointed legs and two pairs of wings |
