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Answer:
-They don't live forever, but slowly evaporate returning their energy to the universe.
-Black holes can have the mass of several million suns.
-Black holes differ from each other in mass and their spin. Other than that, they are all very similar.
-The center of a black hole, where all its mass resides, is a point called a singularity.
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A is the answer. Hope this HELPS!!
This one: "Lee noticed a problem and alerts a teacher".
The second verb should not have been changed to present tense.
You should change the verb alert to past tense: "Lee noticed a problem and alerted a teacher".
