Pteridophyta do not have

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

State reasons for the following:
$(i)$ Tapeworms do not have a digestive tract.
$(ii)$ Frogs have both skin and lungs for breathing.
$(iii)$ $A$ whale is a mammal,not a fish.

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.

Hair-like cilia or whip-like flagella for locomotion are present in kingdom

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