Questions tagged [nitrogen-cycle]

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Why does number of nephrons increase exponentially in kidney evolution?

The number of nephrons is often depicted to be increasing exponentially in kidney evolution. What is the primary reason for that increase?
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Water used in excretion in ureotelism vs ammonotelism

Ureotelism is an adaptation to conserve water, less water is needed to excrete nitrogen compared to in ammonotelism. Is the water usage more or less exactly proportional to the number of nitrogen ...
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Any phyla in Animalia that does ammonia assimilation?

A key step in nitrogen metabolism is the initial assimilation of inorganic ammonia into amino acids. Are there phyla within Animalia that do assimilation of ammonium (NH4+)? Phyla with symbionts from ...