sharks retain more urea in their body fluid blood
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Answer:
because as their body size is big the waste material also more so they retain more urea.
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The urea produced in the body of an organism has to be removed via excretion.
However, some animals like sharks retain the urea produced in their body. this urea retained in the body helps them with osmotic balance.
Because of the presence of urea in blood, sharks become hypertonic in comparison to marine water this allows them to swim freely in the marine water without the fear of dehydration
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