How the root hair adepted their function

As scientist had investigated evolution from a variety fields they have found

Prior knowledge can be gained from personal experience and a) forming well-developed hypotheses. b) listening to opinions of other people on a topic. c) researching previous experiments and results on a topic. eliminate d) no other methods. it can only be gained by personal experience.

The united states uses which source of energy to produce almost 40 percent of its electricity