Geological change will not cause a mass extinction, because it happens on a too big scale - on the scale of millions of years. During such long time, it is more likely that other causes will influence the survival of extinction of species, such as climate change or environmental disasters, and even if there is a small influence, it would not be significant next to other causes.
.........gold??..........its a guess
Answer:
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Explanation: Decomposers are like grinders, they break down dead animals and plants.
When writing a hypothesis, you need to be able to say IF this, THEN this will happen.
That answer sounds great! You might also want to add that the cell cycle is thrown out of control by the mutations that occur. Cancer is fundamentally the accumulation of reproduced mutated cells.