<h2>respiracion aerobic</h2><h2>fotosintesis</h2>
organismo Eucaronte
<h2>pluricelular</h2><h2>reproduciion </h2><h2 /><h2 />
Answer:
The variable that does not rely on another variable. IVs can include time, weather, etc.
Explanation:
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.