We can preserve natural resources by А
drilling for as much oil as possible for just 10 years
B
using mostly trees for energy
с
relying on renewable energy sources
D
burning more fossil fuels

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.