Based on what you know about main-sequence stars, select all of the correct statements from the following list. ✔Since the interiors of stars cannot be observed, there are no theories about their structure. ✔More massive stars live longer; they take longer to use up all their energy. The weight of a star must be balanced by internal pressure. ✔ More massive stars are hotter and brighter. Stars change position on the main sequence throughout their lives. O Outward energy flow in a star is by conduction only.

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