Answer:
As I think answer is may be D.
The planets moons movements and the attraction that can be caused between it
Example : Pluto gains a fourth moon Or a massive new planet in our solar system
Answer:
a) A person living in the wilderness can obtain food by feeding on the different plants and trees in the area. Once, he gets a knowledge of the plants which are edible, he can start to even grow them if he plans to stay for a long time.
b) Many people living in a community can obtain food from many different resources. The can plant fruits and vegetables. They can hunt for wild life animals and cook them.
c) A person living in a community will be able to get more ideas for obtaining food resources. The work of finding the food resources will be divided among different persons of the community instead of just a single one. Hence, in this way obtaining food resources will become easier.
We could burn biomass to produce electricity. it is not a non-renewable resource
