McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

The internal environment of the freshwater fish is ________________ to its surroundings.

A. hypertonic
B. isotonic
C. hypotonic
D. Any of these is correct, depending on the body of water.


2. Freshwater fish actively absorb salt from their surroundings. What must marine fish do to maintain the proper osmotic balance?

A. void salt with feces
B. excrete salt from gills
C. reabsorb salt and water in its digestive tract
D. All of these are correct.
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