What is the purpose of using reverse transcriptions

What is the difference between an igneous, sedimentary and metamorphic rock

Vessels draining the myocardium of the heart, open primarily ,into which chamber?

Aremote community desperately needs more electrical energy. it is located in an area with the following characteristics: average wind speed of 15 – 20 km/hr some medium-sized rivers with slow-moving currents few coal deposits some oil exploration being conducted within 400 miles based on the above information, which energy source would be the most economical and safest for the community to pursue? a. fossil fuel b. hydroelectric c. nuclear d. wind