Introduction to invertebrates of inland waters / James H. Thorp, Walter W. Dimmick, and Alan P. Covich -- An overview of inland aquatic habitats / James H. Thorp and Alan P. Covich -- Protozoa / ...

There are millions of different types of living things on Earth. In order to keep track of them all, scientists put living things into groups based on characteristics that they have that are the same.

Invertebrates are all around us – crawling, squirming and buzzing about their business. From forests canopies to ocean depths, they form about 80% of the known species on Earth. By virtue of their ...