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

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

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Environmental Science
During the winter solstice in the Northern Hemisphere:

The noon sun is overhead at 23.5o S latitude
All of these
Astronomical winter begins in the Northern Hemisphere
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year

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