Two-chambered heart occurs in

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

Characteristics of some organisms are given. Identify their group and give one example of each.
$(a)$ Single-celled,eukaryotic,and photosynthetic.
$(b)$ The body is divided into segments,may be unisexual or hermaphrodite.

State reasons for the following:
$(a)$ Bryophytes are called amphibians of the plant kingdom.
$(b)$ Gymnosperms are called so (naked-seeded plants).
$(c)$ Birds have wings and feathers.

Find out the false statement.

Name the phylum to which Leech and Earthworm belong.