What is it called when each organism has its own unique way to survive

Within multicellular organisms, tissues are organized communities of cells that work together to carry out a specific function. The exact role of a tissue in an organism depends on what types of cells it contains. For example, the endothelial tissue that lines the human gastrointestinal tract consists of several cell types. Some of these cells absorb nutrients from the digestive contents, whereas others (called goblet cells) secrete a lubricating mucus that helps the contents travel smoothly.

Organ sale—for example, allowing or encouraging consenting adults to become living kidney donors in return for money—has been proposed as a possible solution to the seemingly chronic shortage of organs for transplantation. Many people however regard this idea as abhorrent and argue both that the practice would be unethical and that it should be banned