The formation of intense tornadoes requires the most powerful of all thunderstorms, called that you can see here. these thunderstorms, which account for less than 10% of all thunderstorms, usually form in the united states during the spring, between the rocky and appalachian mountains. a) a vortex b) cyclones c) supercells d) wall clouds

Which is not a reason to gentically modify an organism? a.changing the dna of a crop plant to make it resistant to pesticides b.changing the dna of a crop plant to make it produce more yield per acre c.changing the dna of a crop plant to make it resistant to insects d.changing the dna of a crop plant to make it more susceptible to pest insects