On the geological time scale, what era did the first vascular plants appear on Earth?

ON THE GEOLOGICAL TIME SCALE SILURIAN IS THE ERA DURING WHICH FIRST VASCULAR PLANTS APPEAR ON EARTH.

Explanation:

The geological time scale is the system used by the geological scientists to describe history of earth in terms of geological events which means formation of new rock layer. Geological time scale is divided into units and sub-units,the largest of which are Eons, Eons are divided into Era's which are further divided into periods,epochs,ages.

In this periods which are sub division of Era's are divided into multiple in number, Of these periods in the paleozoic period and in silurian era first vascular seedless plants appear on the earth. So, on the geological time scale, silurian is the era during which first seedless vascular plants appear on the earth.

d.

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the answer would be d : p