According to the video, what are the two key ingredients to natural selection?

a. Predation and the environment
b. Reproduction and predation
c. Reproduction and variation
d. The environment and variation

C. Reproduction and Variation

Explanation:

Reproduction could cause gene and chromosomal mutations in the offspring therefore causing variation. The variation could either helpful or detrimental to the offspring depending on the environment and if it helps them live or not.

i'll try what topic lol

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

hope this !