Forensic chemists are analyzing blood samples taken from a murder victim. They run tests for any trace of substances that do not naturally occur in the bloodstream. Nothing odd registers
but they do find extremely high levels of caffeine. What does this most likely indicate about the murder victim?
They drank a lot of coffee.
They worked on a coffee bean plantation
They were poisoned with powdered caffeine.
Someone put arsenic in their coffee.

Compare and contrast the adaptations of free-living flatworms and parasitic flatworms

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

Which of the following is an advantage of solar energy?