I can tell you that it is NOT B.
I got it wrong.
Answer:
Polar stratospheric clouds are all in higher layers of the Earth's atmospheres.
I took the test last week
They would work out how old the fossil was to see how old the egg was
A sugar molecule, ribose (the same sugar that forms the basis of RNA). Attached to one side of this is a base (a group consisting of linked rings of carbon and nitrogen atoms); in this case the base is adenine
www.chm.bris.ac.uk/motm/atp/atp<span>1.htm</span>