Question

The correct order of eras, from most ancient to most recent, along the geological time scale is
A.Paleozoic - precambrian - mesozoic - cenozoic
B.Precambrian - cenozoic - paleozoic - mesozoic
C.Precambrian - mesozoic - paleozoic - cenozoic
D.Precambrian - paleozoic - mesozoic - cenozoic
E.Cenozoic - mesozoic - paleozoic - precambrian

Answer 1

Hint: The earth contains various layers of residue, of which the base layer is the most oldest layer and the upper layer is the latest layer. In light of the time of rocks, a period scale was read and it is known as the geographical time scale, it portrays the various phases of the development of life on the earth in the course of the last huge number of years. A geologic era is a subdivision of geologic time that parts a complete time smaller units of time

Complete answer:
Precambrian time of the Archaeozoic period (3800 million years back) is set apart as the root of life. Palaeozoic time (600 mya - 230 mya) is the "time of ancient life". Mesozoic time (from 230 million yrs back to 63 million yrs ago) is the time of archaic life and incorporates three periods in particular, Cretaceous (135 million yrs), Jurassic (180 million yrs) and Triassic (225 million years). The Cenozoic period (65 million years prior) is otherwise called "time of warm blooded animals or simply mammals" on the grounds that the ascent of first placental vertebrates, their enhancement, and development, just as source and advancement of present day well evolved creatures and that of man, happened during this time.

Hence, the correct answer is option (D).

Note: The developmental stages comprise three Eons, that comprises Eras which are partitioned into Periods that might be additionally partitioned into Epochs. These Eras, Periods, Epochs portray the time of origin and the strength of the specific group of creatures during specific Eras or Periods. It gives the most immediate proof to the idea of development. All together from most established to youngest, the three Eons are as per the following
-Archean Eon: antiquated or ancient.
-Proterozoic Eon: starting life (2.5 billion to 542 million years back)
-Phanerozoic Eon: obvious life (542 million years prior to introduction).

There are times in the Phanerozoic age. All together from oldest to youngest, they are as per the following:
1) Precambrian Era: earliest aspect of earth's set of history.
2) Paleozoic Era: old life, (for example, trilobites)
3) Mesozoic Era: middle life, (for example, dinosaurs)
4) Cenozoic Era: ongoing life, (for example, well evolved creatures and flowering plants).