The answer to the question above is PANGAEA. Pangaea or Pangea is known to be a "supercontinent" that existed during the periods of late Paleozoic era and earlier in the <span>Mesozoic era. This supercontinent was really large and this is the original landmass of the present continents today. This broke up due to plate tectonics.</span>
Answer:
Economic activities - The activity of making, providing, purchasing, or selling goods or services.
Commercial activities - An activity intended for exchange in the market to earn an economic profit.
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<u>Stromatolites are layered mounds of calcium carbonate that were deposited by algae during the Precambrian time.</u>
Answer: Option C
<u>Explanation:</u>
Stromatolites are the deposit of the layer which is mostly of limestone and these are mainly formed by the blue green algae which are only one celled organism of primitive times.
The features of these are that they are normally thin and have layers that might be either light or dark in color and are either flat or some of them even have a shape of a dome.
