The branch of biology which deals with the principles and practice of classification of plants and animals is

Which one is the most striking or common character of the vertebrates?

$(a)$ 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?

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

What is the difference between Bryophyta and Pteridophyta?

Write one difference for each of the following pairs:
$(i)$ Thallophyta and Bryophyta
$(ii)$ Nematoda and Annelida
$(iii)$ Amphibia and Reptilia