Pteridophyta do not have

Hard calcium carbonate structures are used as a skeleton by

Why are bats not placed in birds?

The skeleton is made entirely of cartilage in

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.

$(a)$ What is the significance of binomial nomenclature?
$(b)$ Who introduced the system of scientific naming?
$(c)$ Write any two conventions followed while writing the scientific names.