An animal is dorsoventrally flattened,has three embryonic germ layers,and is acoelomate. Which phylum does it belong to? What are they commonly called? Give one example.

All organisms that are similar enough to breed and perpetuate are called

$(a)$ State two characteristic features of nematodes.
$(b)$ Identify the phylum with the help of the following features:
$(i)$ Spiny-skinned,radially symmetrical,and have tube feet.
$(ii)$ Triploblastic,worm-like,having a segmented body.

Who introduced the system of scientific nomenclature of organisms?

Write appropriate terms for the following:
$(i)$ Animals that are able to maintain a constant body temperature over a wide range of environmental temperatures.
$(ii)$ Animals which have a pseudocoelom.
$(iii)$ Plants which bear naked seeds.

Write true or false for the following statement:
Plants with well-differentiated reproductive tissues that ultimately make seeds are called pteridophytes.