Question 3 10 pts Bony fishes appeared to have evolved in freshwater and then re

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Question 3 10 pts Bony fishes appeared to have evolved in freshwater and then recolonized marine environments. As a result, they are hypotonic to seawater. Which adaptations do bony fishes use in seawater? Excrete large amounts of dilute urine Actively transport ions into their tissues Drink lots of water and actively excrete ions Reabsorb urea to keep a higher osmotic concentration Question 4 10 pts sis, thus the kidney has to create the osmotic conditions to promote water movement in the Water only moves by osmo direction required. How can the kidney produce hypertonic urine? O The kidney has hypotonic regions that make water move out of urine The kidney has hypertonic regions that make water move out of urine The kidney has hypotonic regions that make water move back into urine The kidney is mostly isotonic maintaining water balance

Explanation / Answer

3) drink lots of water and actively excrete ions.

These fishes consume a lot of sea water and the salt is actively excreted from the gills.

4)the kidney has hypotonic regions that make water move out of the urine( parts of loop of henle)

5) ammonia: highly toxic but easi;y dissolves in water

urea: low toxicity and highly soluble in water so it can be concentrated.

uric acid: low water solubility, conserves water but energetically costly

6) isotonic to theri environment. They maintain the isotonicity by different mechanisms

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