Necie hypothesizes that the temperature at which an alligator's egg is incubated influences whether the hatching alligator will be male or female. The independent variable is:

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)