Which reasons are the best for using only the fine-focus knob under high power?

Are salt and soap nutrients or toxins for yeast? explain.

Ineed some everybody. the production of cells during mitosis into specialized function is called: recombination or differentiation

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?