QUESTION 1. Temperature ranges in large bodies of water are narrow.
QUESTION 2. The thermocline is the water level of sudden temp change.
QUESTION 3. An environment with rare sudden temperature changes is suitable for cold-blooded animals.
QUESTION 4. Water is incompressible and must be displaced. Streamlined fish push water aside in front. Water closes in again from behind, propelling the fish forward.
QUESTION 5. Tropical seas and land have more species and fewer individuals
QUESTION 6. Fresh water fish contain more salt than surrounding water. Salt water fish vice versa.
QUESTION 7. Benthic (bottom) pelagic (surface) littoral (near shore)
QUESTION 8. The world's slowest fish is the seahorse, taking 100 hours - more than 4 days - to swim a mile.
QUESTION 9. Plankton grows near shore.
QUESTION 10. Fish develop jaws and paired fins and can inhabit the whole world.
QUESTION 11. A fish's body weight is supported by water. Therefore the fish, almost weightless, gets along with a light, simple bone structure and almost no size limit.
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QUESTION 20.