Who is john locked? this is for world history i need help

Josh is teaching michael how to be an effective speaker. what two general hints for effective informative speaking should josh share?

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.

Nepal is the common garden of different caste ethnic groups language and culture briefly explain the statements