A shell is considered to be biotic because it came from something living. Details about biotic components can be found below.
What is biotic factor?
A biotic factor is a component of an ecosystem that has life or is living.
As opposed to their abiotic counterparts, biotic factors are from living sources. Examples include;
According to this question, a shell is considered living because it is from an animal, which is living.
Therefore, a shell is considered to be biotic because it came from something living.
Learn more about biotic factors at: https://brainly.com/question/13021832
