Which statement describes the environmental factor that affected the skipper butterflies?
Responses
The butterflies could change color.
The butterflies could change color.
The blue variation couldn't reproduce, so the population became redder over time.
The blue variation couldn't reproduce, so the population became redder over time.
The green butterflies had red offspring.
The green butterflies had red offspring.
When the birds moved into the field, they selected against the blue butterflies.