In a controlled scientific experiment,
OA.
all variables are kept constant.
OB. no variables are kept constant.
Oc. one or more variables are kept constant.
OD. only one variable can be kept constant.

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What is true for a substance that releases energy

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)