Which of the following is not a criterion for the classification of living organisms?

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

Identify and write the names of the parts labeled as $A, B, C$ and $D$ in the given figure of a seahorse in your answer book.

$(a)$ In which two ways do amphibians differ from fishes?
$(b)$ Identify the phylum of organisms having the following characteristics:
$(i)$ Pore-bearing animals and radial symmetry.
$(ii)$ Body spiny and radial symmetry.
$(c)$ Why do gymnosperms not require water for fertilization?

Thallophyta,Bryophyta and Pteridophyta are classified as Cryptogamae,whereas Gymnosperms and Angiosperms are classified as Phanerogamae. Why?

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.