Question

what are the criteria which delimit the phylum to its classes?

Answer 1

Answer:

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.

Explanation:

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Answer 2

Symmetry, segmentation, Appendages, skeleton, embryonic development, circulatory system, body cavity, habitat and germ layers are the criteria which delimit the phylum to its classes.

Explanation:

• In the animal kingdom, there are 40 smaller groups referred as phylum and animals are grouped by their main features.

• The criteria which delimit the phylum to its classes are symmetry, segmentation, appendages, skeleton, embryonic development, circulatory system, body cavity, habitat and germ layers.
• Animals are radially symmetrical, bilaterally symmetrical or asymmetrical.
• Animals may or may not have segmented body.
• They have organs or parts attached to the trunk or outer body wall.
• They have endoskeleton or exoskeleton.
• They may have open or closed circulatory system.
• They may be coelomate, psuedocoelomate or acoelomate.
• They may be terrestrial or aquatic as they may live either in fresh water or sea water.
• Animals may be diploblastic and triploblastic.