The answer is C. Chromosomes contain several genes, which are made up of sequences of DNA
O1:2:1 because they are carbon, hydrogen and oxygen
The answer to the blank i think is bond im not 100% sure though..
Explanation:
Astronomers have a huge problem detecting radiation from space because the Earth's atmosphere blocks most of it and stops it from reaching the surface. Visible light and radio waves get through to telescopes on the ground, and some detectors (infrared, UV and gamma) work when they are high up on mountains.
hope this helped!!!
