What gives scientists clues about the kind of organisms that lived in an ancient environment

Scientists make their opinion about the organisms that lived in an ancient environment based on multiple things. Fossils are very important because they show the organisms anatomy. The layers of the ground show the age and the basic climate information, as well as dramatic events in the Earth's history, like super volcano eruptions, meteor collisions, flooding's. Also the pollen is very important for knowing the environment, because it is everywhere and is preserved well, it gives clues about the climate, types of plants, the landscape, thus making opinion about the way of life of the organisms.

The reason why i feel that the theory of plate tectonics is correct because scientists have found dinosaur bones of the same species in africa, asia, and in the americas. which means that they must have been together at one point in time. plate tectonics is also how the hawaiian islands were formed. as the plate hawaii is on was moving north west, magma would melt through the sea bottom and hardening. forming into the island chain. plate tectonics also explains the mariana trench. two plates were moving away from each other and made a giant crack in the ocean floor running 2,550 kilometers (1,500 miles)  long.