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Organism Comparison

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Organism Comparison

1. Tissue Organization

Distinct tissues absent (answer: sponge) Distinct tissues present (answer: all other animals)

2. Symmetry

Radical (answer: earthworm, roundworms and hydra, sponge) Bilateral (answer: all the other animals)

3. Body Cavity

Acoelomate (answer: crayfish, sea fish) Pseudocoelomates (answer: roundworms, clamworm, clam, hydra and lancet) Eucoelomate (answer: pig, grasshopper)

4. Openings to digestive tract

One (answer: planarian, lancelet, sea star, hydra, crayfish, clam) Two (pig, grasshopper)

5. Circulatory system

None (answer: roundworms, earthworms, planarian , lancelet) Open (answer: grasshopper, sea star, hydra, clam, crayfish) Closed (answer: pig)

6. Habitat

Aquatic (answer: sponge, sea star, planarian, crayfish, hydra, lamncelet ) Terrestrial (answer: pig, grasshopper, earthworms) Parasitic (answer: roundworms)

7. Organs of gas Exchange

Skin (answer: Earthworms, roundworms, planarian) Gills (answer: sea star, lancelet, crayfish, clam) Lungs (pig) Spiracles/tracheae (grasshopper, sponge)

8. Organs of Excretion

Skin (sea star, planarian, earthworms, and roundworms), kidneys and lungs (pig), pores (sponge), gills (hydra, crayfish, sea star, and clam), and spiracles (grasshoppers).

9. Type of Locomotion

Walking (pig), jumping/hopping (grasshopper), swimming (sea fish, hydra, clam, sponge, lancelet) and crayfish), wiggling (earthworms, planarian, roundworms).

10. Support Systems

External (clam) Internal (pig, grasshopper, sponge, sea star, crayfish ) Hydrostatic (planarian, earthworms, roundworms, lancelet, hydra)

11. Segmented body

No (Answer: sponge) Yes (all the other animals)

12. Appendages

No (Answer: sponge, earthworm, planarian, roundworm, lancelet) Yes (Answer: All the other animals)

13. Nervous System

Ventral nerve cord (round worms, earthworms, hydra, planarian) Dorsal nerve cord (pig) Post anal tail (lancelet, crayfish) Others (sponge)

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