What appears to trigger the production of higher levels of estrogen associated with the initiation of puberty in girls?
a. a certain body weight
b. a particular amount of body fat
c. fat cells secreting a protein that signals the brain
d. All of these work to trigger estrogen production.
Question 2
What does the phrase A not B error mean?
a. Children will not search for hidden objects unless given an incentive.
b. Children will randomly search for hidden objects, but will quickly become frustrated and give up.
c. A child may reach for a hidden object where it has always been, yet still reach there even when they see the toy hidden somewhere else.
d. A child will search for a hidden toy but will quickly become distracted by other, more interesting objects.
An example of a homeostatically controlled variable: blood levels of glucose in a human.
Martian geological features, such as the "Face on Mars", sometimes trigger facial pareidol
Worldwide Variations in Population and Income Levels Developed countries represent only 18% of the
Production efficiency vs. trophic efficiency
Percentage of higher-income Canadian households
Satellite data showing net primary production. Productivity is coded as red (highest) down through o