Enlist the criteria used for animal classification.
Answers
Explanation:
. Symmetry:
Many protozoan’s are asymmetrical because they are not divisible into equivalent parts; a few show spherical symmetry.
The cnidarians and adult echinodems are usually radially symmetrical around a median axis through the mouth; planes through this axis will divide the animal into radial sectors (antimeres).
Members of most other phyla are bilaterally symmetrical; a lengthwise vertical (sagital) plane divides the animal into equal and opposite halves.
Segmentation:
In the annelids, arthropods, and chordates there is a linear repetition of body parts known as segmentation (metamerism); each repeated unit is a somite (metamere). In earth-worms the successive somites are essentially alike, but they are unlike in different body regions of a crayfish or insect. Metamerism is conspicuous both externally and internally in annelids, is mostly external with arthropods, and mainly internal in man and other chordates (vertebrae, body muscles, some blood vessels, and nerves)
Appendages:
Protruding parts that serve in locomotion, feeding, and other ways are termed appendages; examples are the tentacle of sea anemones, minute setae of earthworms, antennae and legs of arthropods, and the fins, legs, and wings of vertebrates.
4. Skeleton:
Most land dwellers and many aquatic animals have a skeleton for support or protection; it may be internal (frog, man, etc.) or external (coral, crab, insect) and may be of either inorganic or material.
Answer:
Symmetry.
Segmentation.
Appendages.
Skeleton.
Sex.
Embryonic development.
Larvae:.
Explanation:
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