A 1 solar mass star has finally died. How did that star move on a plot of luminosity and temperature (with temperature increasing to the left) during its lifetime before it became a white dwarf?
a. Up to the left, then back down to the main sequence, then to the upper right, then down to the bottom of the main sequence.
b. Up to the upper right, then to the left, then up to the right, then down to the bottom middle.
c. Up along the main sequence of stars.
d. Down to the bottom middle quickly.
e. Doesn't move at all

b. Up to the upper right, then to the left, then up to the right, then down to the bottom middle.

Explanation:

The star moved up to the upper right, then to the left, then up to the right, then down to the bottom middle on a plot of luminosity and temperature (with temperature increasing to the left) during its lifetime before it became a white dwarf.

question

which are human systems?

the amazon rain forest

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the hoover dam

the north american free trade agreement