1. it is composed of groups of tissues performing a similar task
2. it is the basic and smallest unit of life
3. some examples of these are circulatory system skeletal system and digestive system
4. an individual that is composed of many cells that form tissues and organs
5. some examples are connective epithelial and muscle

a. tissues
b. organ
c. organism
d. cell
e. population
f. organ system​