What is lower limit for the mass of a black hole?
a) 2 solar masses
b) 3 solar masses
c) 10 solar masses
d) 30 solar masses

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?

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