Pls help me with these questions will mark brainiest. 100 points

How many countries have portuguese as a national language?

Explain how earths tilt and revolution around the sun affects weather and climate

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?