B Cells aggregated to form a tissue are an example of a lower level being contained by a higher level C Food chain hierarchies represent non-nested systems where the higher levels do not contain the lower levels cells are contained(nested) food chains are non-nestedB Cells aggregated to form a tissue are an example of a lower level being contained by a higher level. C Food chain hierarchies represent non-nested systems where the higher levels do not contain the lower levels. • cells are contained (nested) • food chains are non-nested