Science has limits and cannot answer all questions. give an example of a question that cannot be answered by science

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?

Regarding most of the narrator’s story, which word best describes the tone?