I think it’s A B and C because other sloths are alive and so are trees.
Instead of burning coal to power our country we could use solar panels. As long as we have the sun we will have "free" energy.
Instead of continuing to mine for metals, we could recycle metals and then less greenhouse gases would be released into Earth's atmosphere.
It is tested with the blood gas test
If there where a decrease in the number of decomposers there would be a increase in the number of producers and consumers.
