1. Bony fish appeared to have evolved in freshwater and then recolonized marine
ID: 219417 • Letter: 1
Question
1. Bony fish appeared to have evolved in freshwater and then recolonized marine enviroments. As a result, they are hypotinic to seawater. Which adaptations do bony fish use in seawater? (pick one)
a. Excrete large amounts of dilute urine.
b. Actively transport ions into their tissues
c. Drink lots of water and actively excrete ions.
d.Reabsorb urea to keep a higher osmotic concentration.
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2. Which of the following are the two functions of the urinary system? (Choose TWO)
a. Increase water loss
b. Excrete nitrogenous waste.
c. Excrete phosphorous waste.
d. Excrete digestive waste.
Explanation / Answer
1. c. Drink lots of water and actively excrete ions.
Marine bony fish tend to lose water due to osmosis, so they drink lots of seawater, but excrete the ions through active transport.
2.
a. Increase water loss
b. Excrete nitrogenous waste.
Urinary system regulates blood volume by water loss and excretes nitrogenous waste as urine.
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