Answer:
The earliest stone tool making developed by at least 2.6 million years ago. The Early Stone Age began with the most basic stone implements made by early humans. By 200,000 years ago, the pace of innovation in stone technology began to accelerate. Middle Stone Age tool kits included points, which could be hafted on to shafts to make spears. During the Later Stone Age, the pace of innovations rose. People experimented with diverse raw materials the level of craftsmanship increased, and different groups sought their own distinct cultural identity and adopted their own ways of making things.
Explanation:
Answer: By providing opportunity to promote further questioning and thinking.
Explanation: In discovery Science, the major thing we do is to think about what we are discovering, then ask questions which our discoveries will solve. Because the teacher has given a platform where each group should think about what they have discovered, and then share it with the rest of the class. Any member of the class has an opportunity to ask question, about what the group has discovered. This makes it a discovery Science, because thinking and questioning has been involved.
Because they could not travel through it by river
