From earliest to most recent, what is the correct order in which organisms appear in the fossil record?

a. dinosaurs, invertebrates, reptiles, mammals

b. invertebrates, amphibians, dinosaurs, mammals

c. amphibians, dinosaurs, invertebrates, reptiles

d. birds, amphibians, invertebrates, dinosaurs

The answer would be B

Invertebrates (Organisms with no backbone) came first, then Amphibians (Organisms that live the first part of their lives in the water, then grow to live on land), third there are Dinosaurs (I think you know what dinosaurs are), and finally there are mammals (aka ... us)

B. Invertebrates, Amphibians, Dinosaurs, Mammals