What city is 30n 30e?

It is useful for historians to write narratives so that history can be passed on from their point of view.  think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.

Would there happen to be answer choices?

Iam pretty sure that the answer is either a. -  it would the ecosystem become more stable. or it is d. -  the larger number of species would make the ecosystem more prone to disease.. 
i would go with d.
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scientists think that convection currents flow in earth’s mantle. correct answer: b

convection currents are created because of heat rising and falling inside the mantle. they are generated by radioactive decay in the core. the convection currents move the plates and this activity inside the earth is called plate tectonics.