Which of the following is not an Annelid?

What is haemocoel?

Which among the following have scales?
$(i)$ Amphibians
$(ii)$ Pisces
$(iii)$ Reptiles
$(iv)$ Mammals

Plants that do not have well-differentiated body design fall into the group called

Give reasons for the following:
$(i)$ Bryophytes are called amphibians of the plant kingdom.
$(ii)$ From phylum Platyhelminthes onwards,animals are categorized as 'triploblastic.'
$(iii)$ The presence of 'coelom' in an animal's body is considered advantageous.

State the type of body cavity found in Platyhelminthes. Write whether they are parasitic or free-living.