Star A is B, a white dwarf.
Star B is C, a Red Giant
I don't know at all im lost
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I would think, natural selection and alterations in species over time.
I believe the strength training would be squats.
Squats are considered one of the best exercise for dancers because it train almost all functional muslces needed in the dancing moves simultaneously , allowing the dancers to develop strength in their abdominal, length, and back muscles.
High pressure. Clouds form due to air rising so if the pressure is high, it pushes down on the air which prevents cloud formation.
