Why is ethnic conflict common in sub-saharan africa?

Bottle deposit programs are one way to encourage higher recycling rates. explain how they work

In what way does renewable energy differ form nonrenewable energy?

Which events occurred during the space race? check all that apply. (a) nasa was established. (b) yuri gagarin orbited earth. (c) the soviet union launched salyut. (d) the united states launched skylab. (e) the united states launched explorer 1.