B is the answer to this question as Lipids are fats and are a whole separate macro molecule
Answer: Bam
Explanation: Scientists are able to understand Earth's interior by studying seismic waves. ... Seismic waves travel at different speeds when they pass through different types of material, so by studying seismograms, scientists can learn a lot about Earth's internal structure.
I would say D because it involves more selection but if that one is wrong it is most likely B. But I would go with D
