Will give : )

which statement is describes the environmental factor that affected the skipper butterflies.

a) when the birds moved into the field, they selected against the blue butterflies.

b) the butterflies could change color.

c) the green butterflies had red offspring.

d) the blue variation couldn't reproduce, so the population became redder over time.

The first statement describes the environmental factor that affected the skipper butterflies.

When the birds became involved in the skipper butterflies ecosystem, they became a biotic environmental factor. The other answer choices are not environmental factors, but they are adaptations and examples of survival of the fittest.

Hope this helps! Good luck! :)

The anwser is the universe

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on