Aresearcher discovers a small molecule in muscle tissue that is rich in nitrogen, soluble in water, and lacks phosphorus. the molecule also contains carbon, hydrogen, and oxygen, in uneven ratios. the molecule must be a(n)

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.