Question

question 4 (1 point)
stars are fueled by the nuclear _?_ of elements deep in their interiors.
o a fission
o b fusion
o c both
o d neither

question 5 (1 point)
in general, the smaller a star, the _?_ its life.
o a shorter
o b longer

question 6 (1 point)
the more massive stars are, generally also the more luminous they are. this relationship is known as the _?_
o a competition-predation relation
o b mass-acceleration relation
o c both
o d neither

Explanation:

Question 4

Stars are powered by nuclear fusion. In fusion, lighter nuclei combine to form heavier ones, releasing energy. Nuclear fission (splitting of nuclei) is not the energy - source for stars.

Smaller stars have less mass. They burn their fuel (through fusion) at a slower rate compared to more massive stars. So, they have longer lifetimes.

The relationship between a star's mass and its luminosity is a fundamental concept in stellar astrophysics. The competition - predation relation is an ecological concept, and the mass - acceleration relation is from Newton's second law (\(F = ma\)) and not related to stellar mass - luminosity.

Answer:

b. fusion

Question 5