686.8 j is needed to burn 4.24 grans of pd.
Answer:
Primary energy consists of unconverted or original fuel
Explanation:
for example, primary energy sources include petroleum, natural gas, coal, biomass, flowing water, wind, and solar radiation
Those are the fuels that can be mined, reaped, extracted, harvested, or harnessed directly
The correct answer is a !!
Both should be cut with same restriction enzyme to have sticky ends so that they easily combine with each other !