Genetics is what I would say
Answer:
rise over run
Explanation:
rise refers to the number of units going u or down a graph
run refers to the number of units going left or right
it is seen as so;
,
, or 
Don't panic when I included "delta". Delta, it refers/means the small mathematical triangle found beside the rise and run symbols of y and x
The answer is coal, C.
It takes a long time to regenerate, therefore it is labelled as non renewable energy.
The third answer because I was taught this information