Which of the following is an example of a learned behavior?
birds scattering at the sight of a hawk
birds returning to a backyard bird feeder
birds singing to establish their territory
birds competing for food in the feeder

tl;dr - For gradpoint it's B.

If the bird found a food source in the feeder several times, it has learned that it can survive off of it. Therefore it returns to the feeder.

Hope this helps~

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b

the limb fractures are among the most common fractures. open fractures are comparatively more dangerous. the injury patterns are dependent on many factors, such as the age of the person, and mechanism of the injury. the closed fractures of the limbs if left untreated may lead to a significant amount of the blood loss, which may be life-threatening for the person. approximately 1000-1500 ml of blood is lost in the close fracture of the femur, and 500-1000 ml of blood is lost in the closed fracture of lower part of the limbs.