Correct order is.
Paleozoic $\rightarrow$ Mesozoic $\rightarrow$ Cenozoic
Mesozoic $\rightarrow$ Cenozoic $\rightarrow$ Paleozoic
Cenozoic $\rightarrow$ Paleozoic $\rightarrow$ Mesozoic
Mesozoic $\rightarrow$ Paleozoic $\rightarrow$Cenozoic
The principle of organic evolution envisages
Darwin proposed that new species evolve from ancestral forms by the
How has the free ${O_2}$ been released into the earth's atmosphere whereas there was no free ${O_2}$ at the time of origin of life
Wings of bat, locust and pigeon are an example of