Which two characteristics are used to classify stars on the hertzsprung-russell diagram? a: size and density

b:density and composition

c: composition and temperature

d:
temperature and absolute brightness

D.

Explanation:

Temperature is on the x-axis and Brightness is on the y-axis.

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint