A、The flakes made by early humans are more complex. B、The flakes made by monkeys are used as tools. C、The flakes used by early h

(1)Stone flakes were ancient tools that have been regarded as the handiwork of early humans, but a new study published in the journal Nature indicates this may not actually be the case.
    The study reported on a small group of capuchin monkeys seen making small stone flakes. It’s not apparent the monkeys realized they were making tools.
    Tomos Proffitt, a member of the study team, told NPR that they were expecting to see the monkey use rocks to crack open nuts. The team did see the monkeys cracking rocks against rocks. However, they didn’t see them use the tools they had created.
    " We hypothesize that it’s something to do with getting minerals from the quartz because they lick the dust, they ingest it," Proffitt said.
    In their report, the study team said their observations should cause field researchers use caution and avoid confusing monkey flakes with man-made ones.(2)Proffitt said the flakes made by early humans are " more complex than what we see with the capuchins, though they share the same basic characteristics". He added that there are generally clues discovered along with ancient tools that indicate they were actually used. For instance, there might be cut-marks on nearby bones.
Questions 1 and 2 are based on the news report you have just heard.
1. What does the new study published in the journal Nature indicate?
2. What did Tomos Proffitt say about the flakes?