We all know that independent is containing the x and the dependent is the y. Meaning that the y depends on the x.
The answer to this question is B. Asp
It can also be called a column.
Matter that is not used by consumers in the food chain become "detritus". Detritus, meaning debris or waste, are materials that are missed or uneaten by consumers. Because they do not participate in higher trophic levels, these materials are left to decompose. Detritus is often considered the "missing mass" when measuring the total mass in the food chain.