instruction:
Given a scientific question, generate a correct answer to it.
question:
In atherosclerosis, thickening of an arterial wall due to this can restrict blood flow through the artery?
answer:
plaque formation

question:
What process provides over 99 percent of the energy for life on earth?
answer:
photosynthesis

question:
Crowding and resource limitation can have a profound effect on the rate of what?
answer:
population growth