Are most populations affected by a single limiting resource?

A survey of 791 vacationers for the united states found that they planned on spending at least $2000 for their next vacation. What is the population and sample?

Movie about a vampire who falls in love with a human woman and tries to become human by eating and drinking human food

January 30th: February 12th: Just thought I'd keep you updated on the global warming crisis. Seems the evidence continues to show global warming is indeed "manmade." :D

Man, this global warming thing sure is getting complicated... All this ice we want to shield from a meltdown destroyed entire ecosystems teeming with plant and animal life, so why wouldn't we want Greenland to be lush and green again? Oh that's right, "a complete melt of the ice sheet would...