I would say that the answer is C
You would still have 651 g of a certain compound but in different products, so the splitting of water via electrolysis you still have 2 Hydrogen and 1 Oxygen.
Out of the choices given, the best way to describe the organisms of the Precambrian era are they were single-celled organisms and soft, boneless animals. One thing from that time that we still have today is the jellyfish. The correct answer is C.
Well the extinction of species disrupts the food chain and could either kill off other species or have that particular species migrate to another region and cause another species to starve it's just a really big domino effect
