1. ORGANISM: An organism has several organ systems that work together.
ORGAN SYSTEM: An organ system is a group of organs working together to perform a specific job.
ORGAN: Organs are a group of tissues working together to complete a specific task.
TISSUE: Tissues are a group of similar cells working together.
CELL: Cells are the smallest unit of life in a living organism. In multicellular organisms each cell has a specific job.
EX:
Humans, Animals, Plants
ORGAN SYSTEM
EX:
Circulatory System
Skeletal System
ORGAN
EX:
Heart
Lungs
Skin
TISSUE
EX:
Skin Tissue
Bone Tissue
CELL
EX:
Blood Cells
Bone Cells
Skin Cells