Question

Discuss
the
level of
body organization
in metazoans​

Answer 1

Animal kingdom is divided into two major groups on the basis of number of cells which constitute the body of animals. These groups are called Protozoa and Metazoa. The protozoans are unicellar, eukaryotic, and heterotrophic animals, perform all sorts of basic functions like a metazoan animal.

The unicellular grade animal's are mostly smaller in size (microscopic) with a permeable lim­iting membrane which is related to a high surface area to volume ratio that maintains the shape and size of the animal. In their life cycle, no blastula or larval stage is seen.