What is Paleontology? Paleontology is the branch of geology that deals with the study of life in the past geological ages. It is simply known as the study of fossils . Fossils are nothing but the remains, impressions, or traces of animals or plants. These animals or plants have been said to have lived in the geological past .These fossils provide direct evidence of life that existed millions of years ago. Why is paleontology important? To unfold the history of earth . To understand evolution better. To find and discover the climatic changes or the conditions of the past. To divide the earth's past into periods of the geological time scale . Examples of fossils Trilobites - they are extinct marine arthopods from the paleozoic era . Ammonites - coiled-shell organisms often used to date rock layers. Dinosaur fossils - evidence of giant reptiles that dominat...
INTRODUCTION TO PHYLUM MOLLUSCUS * Phylum mollusca is one of the largest and most diverse groups in the animal kingdom . *It is widely known as mollusca. * The molluscus mainly contains shellfish and a wide variety of invertebrates * Some well kmown animals are chitons, tooth shells, oyesters, mussels, clams, slugs , snails,etc. GENERAL CHARACTERISTICS OF MOLLUSCUS *These molluscan animals mostly contain soft unsegmented bodies that is protected by an external calcareous shell. * It has a well developed heart and vascular system, one or more pair of gills and other breathing organisms in the absencs of gills.