If cowbird eggs are included in an oropendola nest in the open woodlands of Central America, what ...

If cowbird eggs are included in an oropendola nest in the open woodlands of Central America, what
  would be the expected outcome?
 
  a. The cowbird eggs would be ejected from the nest to eliminate the competition.
  b. The cowbird eggs would be ejected from the nest due to a reaction of the mother bird's
  immune system.
  c. The cowbird eggs would not be ejected from the nest because they provide an additional
  food source.
  d. The cowbird eggs would not be ejected from the nest because they provide protection
  from large predators.
  e. The cowbird eggs would not be ejected from the nest because they provide protection
  from parasites.

Question 2

Humans have two options for limiting population growth: We can make a global effort to limit our
  own population, or we can wait until the environment does it for us. Briefly address each scenario.
  What methods would result in a successful global decline in birthrate? What environmental events are
  the alternatives?
 
  What will be an ideal response?