Select from the following.
+ rays or beams;
+ heat energy;
+ warm weather;
+ high pressure;
+ fur and fat;
+ influenza;
+ tornadoes;
+ rising tides;

Fact 1: Cold fronts cause thunderstorms as they pass by. Fact 2: Thunderstorms Thunderstorms give birth to tornadoes. Given the two facts above, cold fronts can give birth to what?
Answer:
tornadoes