The skeleton is made entirely of cartilage in:

The system of scientific naming was introduced by

$(a)$ 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?

Differentiate between a flying lizard and a bird. Provide a diagram.

Explain how,'Two areas of study namely $evolution$ and $classification$ are interlinked'. Justify this statement.

What are gymnosperms? Give two characteristics.