What reagent may be sprayed at a crime scene to identify blood? luminol peptin oxygenation all of the above

Individuals do not compete directly for resources, but are prey for the same predator

How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade

What’s the student’s scientific question