Tutor profile: Laura W.
Subject: Environmental Science
What makes the grizzly bear a keystone species?
Grizzly bears are keystone species because as predators, bears keep down the numbers of several species, like moose and elk. They also carry and deposit seeds throughout the ecosystem. Bears that eat salmon will leave their dropping and the partially eaten remains that provide nutrients such as sulfur, nitrogen and carbon to the soil.
Subject: Earth Science
What does the Doppler Effect tell us about the formation of the Universe?
The Doppler Effect shows us that the spectral lines of a distant object in space shift toward the red end of the visible light spectrum because the universe is expanding.
Subject: Physical Science
The moving particles in an object have __________ energy.
A. Decreasing B. Increasing C. Kinetic D. Potential Kinetic energy is energy "in motion".
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