<span>maintaining a stable internal environment</span>
Answer:
you just draw what the question asks you to do.
Explanation:
I dont remember much of biology but i do remember my teacher saying something about phosphate backbone, i know its not much help. sorry!!
Answer:
B. retain its urine in it’s blood stream
Explanation:
Sharks are cartilaginous fishes that lives in the ocean. Oceans are always salty, hence organisms need to maintain a salt-water balance between their internal and external environment because of osmosis. Sharks are able to maintain this by ensuring that the amount of solutes in their internal environment is as much as that in their external environment.
Sharks retain a chemical contained in urine called UREA in their bloodstream to counter the osmotic effect of the salt concentration in the waters they live. This helps them maintain a concentration balance with their environment.
