Which of the following could possibly increase genetic variation indirectly? toxins predator-prey relationships competition new habitat disasters increased food supply

What do scientists need to look at before developing an argument

And give a detailed description! scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. does this result support the theory of plate tectonics? why or why not?

What would happen if the krill were removed from the food web