MD: Quizizz video (Apex pred, Green World, Trophic Cascades)

What is this idea known as the "green world hypothesis?"

• The idea that predators keep herbivores in check (so they can't, say, eat all the leaves on a tree)

• The idea that herbivores keep predators in check

• The idea that the world is green because there are many trees on earth that make it appear green

• The idea that humans are an apex predator that the earth cannot do without

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Can one predator regulate the composition (make up) of an entire community?

• Yes

• No

• I'm not sure

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How would you describe what a "keystone species" is, and what impact a keystone species may have on its ecosystem?

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What might comparing places with otter populations to those without otter populations tell someone about an ecosystem? Select all potential options:

• The otters have no role in an ecosystem

• That otters help control a herbivore or primary consumer population in its ecosystem

• That otters are very cute

• That otters help make for a more diverse and healthy ecosystem

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What is a trophic cascade?

• an ecological change that happens when an apex predator is removed from the food pyramid

• an ecological change that happens when a herbivore is removed from the food pyramid

• an ecological change that happens when a predator is added to the food pyramid

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What do you think is meant by this statement:

"To ignore the fact there are top down effects is to invite mistakes. One ignores at one's own risk what role apex predators play"

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