levels of organization
T I S S U E S: Tissues are made of a group of similar cells that work together to do a specific job in the body.
Organs:Organs are made up of two or more tissues that work together to do a specific job
4 different types of animal tissues are epithelial, muscle, nervous, and connective.
Organ Systems:An organ system is a group of organs working together to perform particular jobs.
Organisms:Sum of all cells, tissues, organs and organ systems makes an organism. An organisms is made when a group of organ systems work together