B) Primary is where there is nothing no rock or soil
A and B i believe, hope it helped.
Muscle contraction happens only when the energy molecule called adenosine triphosphate (ATP) is present
Answer:
Place a glowing splint in the test tube, and if it reignites, it could be oxygen. Place a burning splint into a test tube, and if it goes out, it could be carbon dioxide. Or, place carbon dioxide gas in limewater, and if it turns milky and gets chunks, it is carbon dioxide.