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.

oxygen +1 most likely

answer; both surfaces of the membrane are nonpermeable