ITS ACTUALLY ASTRONOMY What is the name for a star that has two shells of hydrogen and helium undergoing fusion?
A. asymptotic giant branch star
B. Supergiant
C. hypergiant
D. supernova

*please help thx*

The energy released by a nuclear fusion reaction is produced when

Which statement correctly describes the interaction between magnetic poles? north and south poles attract each other. north and south poles repel each other. two north poles will attract each other. two south poles will attract each other.

Aheat engine that operates on a carnot cycle has an efficiency of 0.420 when its low-temperature reservoir is at 10 ∘c.part aby how many degrees celsius must you increase the temperature of the high-temperature reservoir to increase the efficiency to 0.600 if you continue to use the same low-temperature reservoir?