Was is oxygen found in the atmosphere millions of years before it was present in the oceans?

!if we removed the wolf, snake, and hawk from this food web, what best explains the impact it would have? a) the number of producers would increase. b)the number of decomposers would increase. c)the number of primary consumers would increase. d)the numbers of primary consumers would decrease.

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

In which layer do organisms on earth love?