1. Tissue Organization
Distinct tissues absent (answer: sponge) Distinct tissues present (answer: all other animals)
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)
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)
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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