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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.