The nutrient is phosphorus
<h3>The phosphorus cycle</h3>
Phosphorus cycles between living components of the earth (biosphere) and the soil (geosphere).
The element's reservoir is mainly the sediments of the ocean and rocks. Phosphorus gets into the soil by weathering of rocks.
Plants are able to pick the element up from the soil and animals are able to get their phosphorus by consuming plants.
When plants and animal die, their body decomposes and the phosphorus in them enters the soil.
Thus, the cycle being referred to in the illustration is the phosphorus cycle.
More on phosphorus cycle can be found here: brainly.com/question/15020567
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1)left bronchus
2)pleura
3)trachea (starting)
4) cartilaginous rings
5)alveoli
6)atrium
7) diaphragm
Cartilaginous rings help in supporting the trachea from collapsing !!
I am going to assume you meant the "first trophic level" of the ecosystem. The first tropic level of an ecosystem is made up of producers, so the answer is C, Acorns.
Layer c is the oldest and then it’s b and a
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