Pteridophyta do not have

Classify the following organisms based on the presence of a true coelom: $Spongilla$,$Planaria$,$Scorpion$,$Birds$,$Ascaris$,$Nereis$.

Give examples for the following:
$(a)$ Bilateral,dorsiventral symmetry is found in ...............
$(b)$ Worms causing disease elephantiasis is ..............
$(c)$ Open circulatory system is found in ............. where coelomic cavity is filled with blood.
$(d)$ ............... are known to have pseudocoelom.

Organisms without a nucleus and cell organelles belong to:
$(i)$ Fungi
$(ii)$ Protista
$(iii)$ Cyanobacteria
$(iv)$ Archaebacteria

In which group of animals,the coelom is filled with blood?

State reasons for the following:
$(a)$ Mammals have mammary glands.
$(b)$ Annelids have a true body cavity.
$(c)$ Fish possess gills.