The skeleton is made entirely of cartilage in

Two-chambered heart occurs in

The book 'Systema Naturae' was written by

Study the figure and answer the following questions:
$(a)$ Label $A$ and $B$.
$(b)$ Identify the organism and its kingdom.
$(c)$ Name two organisms (other than the one shown here) belonging to the same kingdom.

Who introduced the system of scientific nomenclature of organisms?

Write true $(T)$ or false $(F)$ for the following statements:
$(a)$ Whittaker proposed five kingdom classification.
$(b)$ Monera is divided into Archaebacteria and Eubacteria.
$(c)$ Starting from Class,Species comes before the Genus.
$(d)$ Anabaena belongs to the kingdom Monera.
$(e)$ Blue green algae belongs to the kingdom Protista.
$(f)$ All prokaryotes are classified under Monera.