The answer is the amino acids
Decomposers are necessary in the food chain because they return nutrients to the ecosystem (2)
Answer: The long, thin, probing beak allows finches to feed on insects.
Explanation:
I think the correct answer is nitrogen. Among all the main nutrients in the biosphere, the substance that is fixed or constant inside the nodules in certain roots of plants would be nitrogen. Hope this answers the question. Have a nice day.