Environmental Science
Freshwater protozoans react to a/an __________ environment by removing water through _______

isotonic, a contractile vacuole
hypotonic, turgor pressure
hypotonic, a contractile vacuole
hypertonic, a contractile vacuole

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Environmental Science
The aurora is produced by:

Fast-moving charged particles colliding with air molecules
Reflections of sunlight by polar ice fields
Scattering of sunlight in the upper atmosphere
The combination of molecular and atomic oxygen to form ozone
Burning oxygen caused by the intense sunlight at high altitude

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