

ENVS1401L Exam 2 Review
Flashcard
•
Biology
•
University
•
Practice Problem
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an invasive species?
Back
A species that is not native to a particular environment, tends to outcompete native species, and causes ecological or economic harm.
2.
FLASHCARD QUESTION
Front
How do you calculate average velocity?
Back
Average velocity = Total distance / Total time. For example, if a ping-pong ball travels 3 meters in a total time of 20.6 seconds (6.5 + 7.2 + 6.9), the average velocity is 3m / 20.6s = 0.145 m/sec.
3.
FLASHCARD QUESTION
Front
What was one impact of the reintroduction of wolves to Yellowstone National Park?
Back
The number of trees increased due to reduced grazing pressure from deer and elk.
4.
FLASHCARD QUESTION
Front
What is the current status of biodiversity loss on Earth?
Back
Extinction rates are currently hundreds of times higher than natural 'baseline' rates, primarily driven by human activity.
5.
FLASHCARD QUESTION
Front
What is species richness?
Back
Species richness refers to the number of different species present in a given area. For example, in a backyard with 2 frogs, 3 mice, 1 squirrel, and 5 moles, the species richness is 4.
6.
FLASHCARD QUESTION
Front
What is a keystone species?
Back
A species that has a disproportionately large effect on its environment relative to its abundance.
7.
FLASHCARD QUESTION
Front
What is a trophic cascade?
Back
An ecological phenomenon triggered by the addition or removal of top predators, leading to changes in the ecosystem structure and nutrient cycling.
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