Tag Archives: animal classification

Three cell Layers – Germ layers

By | May 4, 2021

Organisms more complex than Sponges forms two or three tissue layers ,also called as germ layers.A germ layer is collection of cells formed during embryo genesis. Radially symmetrical cnidarians have two germ layers in endoderm and ectoderm making them diploblastic.Organisms with Bilateral symmetry produce one more additional layer between ectoderm and endoderm called mesoderm. These… Read More »

Classification of Animals

By | April 17, 2021

What is the need to classify organisms present around us??? “There are an estimated 1.5 – 1.7 million named species on earth (E. O. Wilson, 2001). Of these, invertebrates account for >99%. In reality there may be 13 620 000 species (or more) in total according to the Global Biodiversity Assessment”. 1) To give specific… Read More »