What does Spectral Class mean?
(In your own words)

Babies with very low or very high weight are less likely to survive .

Based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."