Hay algun ser vivo que evolicione y sea otro ser vivo?

La verdad es que, literalmente, no existe un "fósil viviente". Todas las especies evolucionan, incluso si no es obvio.

Explanation:

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.