This document defines and compares different biological levels of organization in the body, from cells to tissues to organs to organ systems. It states that cells like white blood cells help fight infection. Tissues are groups of similar cells that work together for functions. There are four basic tissue types. Organs are groups of tissues that form distinct structures to perform specialized tasks. Organ systems are groups of organs working together for certain jobs. The organism is formed by all the organ systems working together.

1. Eagle Period 8

2. Eagle cells White blood cell: One of the cells the body makes to help fight infections.

3. Eagle tissue An aggregation of morphologically similar cells and associated intercellular matter acting together to perform one or more specific functions in the body. There are four basic types of tissue: muscle, nerve, epidermal, and connective.

4. Eagle organ a grouping of tissues into a distinct structure, as a heart or kidney in animals or a leaf or stamen in plants, that performs a specialized task.

5. Eagle organ system Different organs working together to perform a certain job to form an organ system

6. organism All the systems working together to form the orgaism