When asked if the miners will be taken care of by the government after digging the tunnel, Boris Shcherbina tells the truth in saying "I don't know." Why do you think he is now choosing to tell the
truth?

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.