39. chemical analysis of fossils can reveal: exact genetic sequences information about ancient atmospheric…

Brief Explanations:

Fossil - chemical analysis can detect isotopes and elemental compositions. Isotopes in fossils can give clues about ancient atmospheric conditions like oxygen - carbon dioxide ratios. Genetic material degrades over time and is hard to get exact sequences from fossils. Behavioral patterns and population densities are not directly revealed by chemical analysis.

Answer:

Information about ancient atmospheric conditions