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A population of deer was threatened with overpopulation until cheetahs were imported. After a couple of years, there were fewer deer but the average running speed of the deer had increased. This is an example of: 

Dwarf mistletoes are flowering plants that grow on certain forest trees. They obtain nutrients and water from the vascular tissues of the trees. The trees derive no known benefits from the dwarf mistletoes. Which of the following best describes the interactions between dwarf mistletoes and trees?

In the video Don’t Panic, Hans Rosling talks about “Peak Child. When did the world population reach “peak child?”

In a mutualism between a fruit tree and a frugivore (animal that eats fruit), the tree provides:

Regardless of geography, culture, and religion, as child mortality rates ___________ and access to family planning increase, families across the world are choosing to have smaller families.

Zoonotic diseases are infectious diseases of animals that can cause disease when transmitted to humans.  

An individual who lacks the amino acids needed to synthesize dopamine or serotonin is more likely to have a desire for drugs or alcohol.

Which of the following statements is true about caffeine?

What is the main nutritional impact from using marijuana?

A patient with dental disease or missing teeth may need an altered-consistency diet and education on nutrition for dental health. Most likely this is as a result of use of which of the following substances?