Identify the names of animals that lived on earth before dinosaurs.

Trilobite and armored fish existed before the dinosaur

Explanation:

As seen in the rock layers, the layers at the bottom represents the species that existed first on the time scale as compared to the species lying in the layers above it.  

Hence, trilobite and armored fish existed before the dinosaur because they lie at lower layer of soil deposits.  

Geological age “premian” existed before the dinosaur age and during that time the prominent form of life was trilobite.

c should be the answer

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.