1. The Organization of Living Things
Section 3

2. I. The Benefits of Being Multicellular
A. Multicellular organisms grow by
making more small cells, not by
making their cells larger
B. Some benefits of being multicellular
Larger size
many multicellular organisms
are small
usually larger than single-celled
prey to few predators
eat a wider variety of prey

3. Longer Life
the life span of a multicellular organism
is not limited to the life span of one cell
Specialization
each type of cell has a special job
specialization makes cells more
efficient
example
cardiac cells = heart

4. II. Cells Working Together
A. tissue
is a group of cells that work together
to perform a specific job
materials around and between cells
are considered part of the tissue
B. Animals have 4 basic types of cells
nerve
muscle
connective
protective

5. C. Plants have 3 basic tissues
transport- moves water and nutrients
protective - covers the plant; retains
water; protects plant for damage
ground - photosynthesis takes place
here

6. III. Tissues Working Together
A. Organ
a structure that is made up of 2 or
more tissues working together to
perform a specific function
example - heart
made of cardiac muscle
nerve muscle
blood vessels
stomach
muscle tissue
connective tissue
nervous tissue

7. B. Plants have different types of tissue
leaf- contains tissue to trap light for
energy
stems and roots are also organs

8. C. Organs Working Together
groups of organs working together to
perform a particular function is an
organ system
examples - digestive system
stomach, intestines
plant organ systems
leaf, root and stem systems

9. IV. Organisms
A. Anything that can perform life processes
by itself is an organism
unicellular - single celled organism
bacteria
protists
some kinds of fungi
B. Some unicellular live together in
colonies
but each cell must carry out life
processes

10. V. Structure and Function
A. Structure
is the arrangements of parts in an
organism
includes shape of part
material made of
B. Function
is the job the part does ex