Process:  -A male and female bird mate -The female lays eggs -The eggs are incubated by the parents, by sitting on them, for weeks -The bird hatches from an egg -The parents feed them as the continue to grow -Develop flight feathers -The parents teach them to fly -After learning to fly they leave the nest to live on their own -The next year they breed beginning the cycle again -
 Question: What is the effect of there has been no pressure build up on there are less hatches from an egg.?
none