The 'Origin of Species' was written by:

What is bilateral symmetry?

$A$ plant specimen was found without differentiated roots.
$(a)$ Which plant structure helps in attaching this plant to the substratum?
$(b)$ To which group would you classify this plant?
$(c)$ Which plant could it be?

Give reasons for the following:
$(i)$ Bryophytes are called amphibians of the plant kingdom.
$(ii)$ From phylum Platyhelminthes onwards,animals are categorized as 'triploblastic.'
$(iii)$ The presence of 'coelom' in an animal's body is considered advantageous.

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

Homo sapiens is the scientific name of human beings. What do these two terms imply?