Question

give the names of biotic components necessary for life on the earth, explain the layers formed by them

Answer 1

water ,air ,food are biotic component required for life on earth

Answer 2

first of all, understand what is biotic components or biotic factors ?
biotic components are any living components that affects other organisms. for example , tree, human , animals , bacteria etc.. all are biotic components because they affect other organisms.

now, you should know that there are only three types of biotic components that are necessary for life on the earth. these are : $\textbf{producers}$ {like tree}, $\textbf{consumer}$ { who depends on producers like human } and $\textbf{decomposer}$ { break down chemicals from producers and consumers into simple form which can be reused like bacteria , fungi etc..}