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Answer:
3) 1.5
5) Criteria for animal classification are:
1. Symmetry: Animals are radially symmetrical, bilaterally symmetrical or asymmetrical.
2. Segmentation: Animals may or may not have segmented body.
3. Appendages: Animals may have organs or parts attached to the trunk or outer body wall.
4. Skeleton: Animals may have exoskeleton or endoskeleton.
5. Embryonic development:
6. Circulatory system: Animal may have open or closed circulatory system.
7. Body cavity: Animals may be coelomate, psuedocoelomate or acoelomate.
8. Habitat: Animals may be terrestrial or aquatic. Aquatic animals may live in either fresh water or sea water.
9. Germ layers: Animals may be diploblastic or triploblastic.
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