9th biology new book 2025|| chapter 5 || Levels of Organizations|| скачать в хорошем качестве

9th biology new book 2025|| chapter 5 || Levels of Organizations||

The levels of organization in biology, from simplest to most complex, are: cells, tissues, organs, organ systems, and organisms. These levels build upon each other, with cells forming tissues, tissues forming organs, and so on. Cells: The fundamental units of life, carrying out basic functions. Tissues: Groups of similar cells working together to perform a specific function. Organs: Structures composed of different tissues that work together to perform a more complex function. Organ Systems: Groups of organs that work together to carry out major bodily functions. Organisms: Individual living things made up of all the preceding levels.