Currently, radioactive waste is:
buried underground
sent into space
stored in landfills
recycled

buried underground

Explanation:

Radioactive waste is a waste that exhibit radioactive material. It includes the products of nuclear reactors and radioactive elements like uranium, radium, and polonium . The radiations emitted by these wastes are likely to cause mutations in living beings which produce adverse symptoms and may also cause explosion when the radiations come in contact with air. Therefore, these wastes are required to be buried underground so that the radiations from these wastes may not leak out and cause hazards.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong