The observer can conclude that the sound is moving away from them and that its speed is increasing.
Answer:
1: surface temperature
2: red giant
3: The brightest stars are called supergiants. Star clusters are rich in stars just off the main sequence called red giants. Main sequence stars are called dwarfs.
4: A white dwarf is very dense
5: red giant
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The answer should be B. a stable isotope to a decaying isotope.
Answer:
B . energy cannot be created or destroyed
