Hi, a caterpillar and a tree have a parasitic relationship, this means that it involves one organism living on or in another organism and harming it. The caterpillar is the organism that lives in the plant and eats it.
Caterpillars live in trees, bushes, dark areas and they eat hosts plants. Plants make their own food. They also get their nutrients from the sun.
Plant roots absorb ammonium ions and nitrate ions in the process of assimilation to use these ions to make molecules like <em>DNA, amino acids, and proteins</em>.
Animals cannot absorb these ions directly; hence they need to consume these plants for the nutrient supplies.
