Write a paragraph describing how earth would be different if photosynthetic plants had not evolved.

The world would be very different in terms that there would not be many animals or there would be different animals. The reason for this is... if there are no photosynthetic plants the animals would have barely anything to eat so if these photosynthetic were not here humans might not even be alive due to lack of food. The main creatures would live in the sea to eat algae or similar.

It was said to have happened by earthquakes, the shifts in the tectonic plates moved everything 

It is mutualism commensalism parasitism predator prey