I believe the answer is Shaping.
Shaping is a reinforcement technique which use a reward that given gradually after the subject is showing a certain desired traits.
On parakeets, this could be done by giving them a food reward everytime they move their head closer to the place where we want it to be (closer to your cheek)
Answer:
C. A pull factor for accessible resources
Explanation:
Own culture is "ethnocentrism"...own standard is "cultural relativism"
The most basic definition of fertile is "being able to produce offspring". In humans this means being able to have children, and in other species, such as plants, it means being able to reproduce: by producing seeds for example.
