The collection of all structures that are composed of one or more living cells (see cell). Biological living objects (or BLO s) might either be instances of organism (like dogs or pine trees) or components of such whole living organisms (like noses, tails, and pine needles). The healthy leg of a living person is a BLO (as is the person), but an amputated leg is not a BLO. Almost every instance of living thing is either capable of biological reproduction itself or has components which are capable of biological reproduction (such as the cells in a living arm). Red blood cells are abnormal instances of BLO in that they cannot reproduce.