Scientists collected samples of each group of flies. They placed some of the flies, together, in flasks with both apples and hawthorn fruit. Other flasks contained either apple-eating flies or Hawthorne-eating flies. Only the flies in the single fruit flasks mated and produced offspring. To confirm their results, the scientists isolated flies from each group and put one of each into a flask with food. Eventually, the flies died without mating. What conclusions apply to this situation? All BUT ONE could apply.