GIVING BRAINLEST TO WHOEVER HAS THE RIGHT ANSWER! Plz and thx Food and fossil fuels are considered to be sources of energy

1. Mechanical

2.Light

3.Nuclear

4. Chemical

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)