Theoretical Foundations of Development Planning: Project Evaluation

Fish are classified in several classes by which its study becomes easier. Fish having similar properties are: contained in the same group. Various classes of fish are Thelodonti, Anaspida, Cephalaspidomorphi, Galeaspida, Pituriaspida, Osteostracy, Gnathostomata, Placodermi. jawless fish are classified under the group Thelodonti, which are very similar to Heterostraci, and are not armored. The Pitu...