Did reptiles or amphibians occur first?

Which of the following statements best explains why there tends to be a greater number of large cities in southern africa than the east africa

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?

If the same organisms appears on two different continents, this is evidence of