Question

The fossil record shows that organisms in older rock strata are simpler than those found in younger rocks. This observation provides support for
the theory of evolution

the principle of original horizontality

genetic drift

speciation by punctuated equilibrium

Answer 1

Ok.......
The show of older rocks being simpler than younger rocks could mean that the rocks had a genetic change. The genetic change could be different things, the rocks sediment could have more sand and less clay or the rocks could have more atoms packed tighter together. That type of change of something is called
Genetic Drift 

H0P3 It H3LPS :)

Answer 2

The theory for revolution.