Which among the following is exclusively marine?

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

Corals are:

Give the appropriate term for each of the following:
$(a)$ Complex sugar that makes the fungal cell wall
$(b)$ Exposed seeds
$(c)$ Blue-green algae
$(d)$ Basic unit of classification
$(e)$ Group of unicellular eukaryotic organisms

Which among the following phyla is exclusively marine?

$(a)$ In which two ways do amphibians differ from fishes?
$(b)$ Identify the phylum of organisms having the following characteristics:
$(i)$ Pore-bearing animals and radial symmetry.
$(ii)$ Body spiny and radial symmetry.
$(c)$ Why do gymnosperms not require water for fertilization?