AP BIOLOGY

Detailed explanation-1: -A fossil record is a collection of fossils that have been studied and placed in taxonomic and chronological order. The sequence in which the events occurred, from first to last, is known as chronological order.

Detailed explanation-2: -Sedimentary rocks typically occur in horizontal layers called strata. In undisturbed strata, younger layers sit on top of older ones. This is known as the law of superposition.

Detailed explanation-3: -Fossil layers are fossils that formed in sedimentary rock. Sedimentary rock is rock that is formed in layers by the depositing and pressing of sediments on top of each other.

Detailed explanation-4: -The largest, or heaviest, settle first, and the smallest, or lightest, settle last. Slight changes in particle size or composition result in the formation of layers, also called beds, in the rock. Layering, or bedding, is the most obvious feature of sedimentary rocks.

Detailed explanation-5: -The type of rocks in which dinosaur fossils (and almost all other fossils) are found is called sedimentary rock. Sedimentary rock generally occurs as flat layers called strata (single layers called stratum).