QABiology › Which is correct order of increasing geological time scale for a hypothetical vertebrate evolution?
Q

Which is correct order of increasing geological time scale for a hypothetical vertebrate evolution?

a) cenozoic, mesozoic, palaeozoic, precambrian

b) Cenozoic, palaeozoic, mesozoic, precambrian

c) Precambrian, palaeozoic, mesozoic, cenozoic

d) Precambrian, palaeozoic, mesozoic , cenozoic

A

Answer: C. Proterozoic, Palaeozoic, Mesozoic, Cenozoic

Explanation: The Proterozoic era refers to the first era when there was a buildup of oxygen in the atmosphere, as well as the emergence of multicellular organisms at the most primitive level.

Only after the emergence of oxygen in the atmosphere was the earth able to sustain life forms.

The Cenozoic era was marked by the movement of the different continents to their current positions. It also heralded the evolution of plants and animals.

The Precambrian era refers to the time when the fossil remains of hard-shelled animals were first discovered by archaeological excavations.

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