In the taxonomic hierarchy, the family comes between:

State reasons for the following:
$(a)$ Tapeworm does not have a digestive tract.
$(b)$ Frogs use both skin and lungs for breathing.
$(c)$ Birds have pneumatic/hollow bones.

Write three characteristics each of the following groups of animals:
$(a)$ Platyhelminthes
$(b)$ Nematoda

Real organs are absent in

Pteridophyta do not have

Identify the phylum for the following characteristics given:
$(a)$ Organisms with jointed appendages.
$(b)$ Organisms are generally flatworms.
$(c)$ Body is segmented.
$(d)$ Skin of organisms is full of spikes.