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Q. Which other phylum of the animal kingdom present species with exoskeleton?
Arthropods present exoskeleton made of chitin. Echinoderms do not have exoskeleton but they present a calcareous endoskeleton. Some chordates also have an external carapace.
phyla of animal like protists that have free living members
Q. What do you mean by Hemichordata ? Hemichordates re vermiform (worm-like) animals which have few characters like those of the chordates, hence the name hemichordata (hemi :
Explain the Cardiac Cycle of human body? The different stages of a heart pumping cycle are referred to as follows: contraction of the ventricles is called systole, and relaxati
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