Discussion
In freshwater environments, reptiles are
Answer: A
Reptiles in fresh water are hyper-osmotic.
Their body fluids are much more concentrated than the dilute fresh water around them. Water therefore tends to enter their bodies by osmosis and salts tend to leak out, so freshwater reptiles must limit water uptake and conserve salts.
Hypo-osmotic describes animals in sea water whose fluids are more dilute than the sea, such as marine bony fishes. Iso-osmotic means equal concentration, and hypotonic is the wrong way round for freshwater animals.
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