What are the main hearths of the world?

Many feel that the u. s. should not give money to the world bank to aid people in other countries. true or false

Renaldo and nasreen build an electromagnet by wrapping a wire around a nail and connecting the wire to both terminals of a battery. when they test the electromagnet, it can pick up 6 paper clips. their teacher wants all groups to pick up at least 10 paper clips. what could renaldo and nasreen do to increase the number of paper clips their electromagnet picks up?

Impact of over population and under population?