a crab living in an estuary that lives in both freshwater and saltwater, is essentially an osmoregulator. match the action on the left with the correct condition on the right: group of answer choices gills take in water by osmosis during either tide urine is concentrated and of small amount during high tide (salt water) crab consumes water and salt from food during high tide (salt water) skin loses water by osmosis during low tide (fresh water)