What type of decay is this?

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Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?

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)

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule