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Levels of Organization
NGSS Unit 6
7th Grade Science
What do all of these pictures have in common?
Multicellular Organisms
• In unicellular (single-celled) organisms, the single cell performs all life functions. However … multi-cellular organisms have various levels of organization.
• Individual cells may perform specific functions and also work together for the good of the entire organism.
• Multicellular organisms have 5 Levels of Organization from simple to complex.
Level 1: Cells
• Basic structural unit of living things
• May serve a function within the organism
• Examples: • blood cells, nerve cells, bone
cells ,etc.
Level 2: Tissues
• Made up of cells of similar structure and function and work together to perform a specific function.
• Examples:• Blood, nervous, bone, etc.
Level 3: Organs
• Made up of tissues that work together to perform a specific activity.
• Examples:• Heart, brain, skin, etc.
Level 4: Organ Systems
• Groups of two or more organs that work together to perform a specific activity.
• Examples: • Circulatory system, digestive
system, nervous system, endocrine system, etc.
Level 5: Organisms
• Entire living things that can carry out all living processes.
• Usually made up of organ systems, but an organism can be made up of only one cell such as a bacteria.
• Examples:• Bacteria, mushroom, sunflower,
human, etc.
Levels of Organization Cells are the simplest level of organization.
However … what makes up cells?
Exit Slip – Writing Prompt
Complete on the next empty page in your Science Notebook.
• In your own words, define what a cell is. Also explain how one single cell can create a multi-cellular organism such as a human being. In your explanation, use levels of organization to support your response.