The present day continent of north america was part of 200 million years ago. a. laurasiab. gondwanaland c. neither laurasia nor gondwanaland

Option (A)

Explanation:

The earth's crust is comprised of the lithospheric plate and they are constantly in motion over the viscous layer of asthenosphere due to the generation of convection current in the mantle. It is due to the heat radiated from the interior of the earth.  

These plates were once all together forming a supercontinent named Pangaea. This Pangaea got separated into Laurasia and Gondwanaland.

North America was formed from the separation of the Laurasia about 200 million years back.

This plate motion was proved by some of the evidence put forwarded by Alfred Wegener. The continental drift theory that was modified to Plate tectonic theory was able to explain the mechanism behind this plate motion.

Hence, the correct answer is option (A).

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.