Question

Which feature is shown ONLY by higher invertebrates, as compared to lower invertebrates

Answer 1

Three germs layers are shown only by higher invertebrates as compared to lower invertebrates.

During gastrulation the cells group into three layers, the first is the 'ectoderm' which then in turn generates the 'mesoderm' and 'endoderm' layers.

In higher vertebrates, such as mammals and birds, the mesoderm and endoderm are generated from an axis running through the centre of the embryo.

However, in lower vertebrates, such as amphibians and fish, the two layers are generated around the edge of the embryo.

Answer 2

Answer:

There are over 30 phyla dedicated to invertebrates. Major invertebrate phyla that you should know include porifera, cnidaria, platyhelminthes, nematoda, mollusca, annelida, arthropoda, and echinodermata