Corals are

Write two characteristic features of the phylum to which Ascaris belongs. Name the parasitic worm that causes elephantiasis.

In which group of animals,the coelom is filled with blood?

Write the most striking features of the following phyla:
$(i)$ Arthropoda
$(ii)$ Amphibia
$(iii)$ Porifera

The phylum in which organisms contain a pseudocoelom is

Classify the following organisms based on the absence/presence of a true coelom (i.e., acoelomate, pseudocoelomate, and coelomate): $Spongilla$, $Sea \text{ } anemone$, $Planaria$, $Liver \text{ } fluke$, $Wuchereria$, $Ascaris$, $Nereis$, $Earthworm$, $Scorpion$, $Birds$, $Fishes$, $Horse$.