What are the function do the roots have in a potato plant

The roots of a potato plant (which is the potato itself) store carbohydrates.

This is why potatoes are so starchy - they are full of carbohydrates!

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

the correct answer is d