S1: Palaeobotany is the study of fossil plants preserved in rocks dating back in millions of years.
P : Records of the history of the world are contained in fossils.
Q : Through the ages, plants have evolved from simple to more complex forms.
R : First there were water plants then land plants appeared during the Paleozoic era.
S : But since the fossil remains appear locked in rock layers, they are closely related to the geologist area of investigation.
S6: The fossil plants indicate the age of the rock, and also point to facts regarding climate, temperature and topography.
The Proper sequence should be: