Unifying characteristics:
4 characteristics of Arthropods , 4 characteristics of Chordates , 3 characteristics of Molluscan
Characteristics of arthropod
1. Presence of exoskeleton to cover & protect the body
2. Segmented bodies (internally & externally)
3. Limbs are jointed in arthropod.
4. The circulatory system is simple and open.
Characteristics of chordates
1. Presence of notochord.
2. Presence of post anal tail.
3. Dorsal hollow nerve cord.
4. Pharyngeal gill slits present.
Characteristics of molluscs
1. Mantle which secrets the shell is present.
2. The toothed structure radula is present.
3. Unsegmented body.
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