Sharks are osmoconformers that maintain osmolarity with the saltwater but keep ion concentrations similar to osmoregulators. To do this they must use non-ions to osmoregulate, such as urea. As such sharks take on excess ions from the water because their bodies are at a significantly lower ion level than saltwater. How are the excess ions eliminated?
A. active transport across the gills
B. Rectal gland
C. diffusion across the gills
D. None of the answers are correct.
Answer: B
Biology & Microbiology
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