A. Mobbing is a behavior that a social group of birds uses to respond to a predator threat to the entire group. B. Mobbing is a behavior that adult birds use to respond to a
predator threat to nestlings.
C. Mobbing is a behavior that immature birds use to respond to a predator threat to themselves.
D. Mobbing is a behavior that individual birds use to respond to a predator threat to themselves.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.