I would like to know if my answers are correct the questions

I would like to know if my answers are correct. the questions is at the bottom of the pictures

Quaternary Mesozoic Tertiary Paleozoic 100 Cretaceous Jurassic Triassic Pennsylvanian iso Mississippian Devonian Silurian Ordovician Cambrian Select the letter that best represents the time period of the first living organisms:

Solution

Considering the evolutionary history of organisms, the most primitive organisms were single cellular prokaryotes. These organisms appeared in the archean time near the paleozoic era.

On the contrary, cenozoic era was predominantly occupied by mammals hence it is,also called the age of mammals.

Importantly, the second question asking the diversification time of mammals or hominids will be answered as cenozoic and all tge eras after it because post cenozoic era, mammals especially hominids excelled on earth.

Hence, the correct answer is paleozoic era, not cenozoic era.