Lesson 31 Survival Part 2. In our last lesson we learned that some living things are unicellular and...
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Transcript of Lesson 31 Survival Part 2. In our last lesson we learned that some living things are unicellular and...
The amoeba can carry out eating, digestion, locomotion, breathing and removal of waste all in one
single cell.
Unicellular organisms develop functions that will help them
survive and they develop structure that will support those functions.
All unicellular organisms must be
small so the organism’s surface
area is greater than or equal to the organism’s volume. This
allows the organism to ventilate.
All unicellular organisms must be small. Larger organisms must
be multicellular so the organism can
survive.
Multicellular organismsare organisms that consist of more than one cell and have differentiated cells that perform specialized functions in the organism.
Multicellular organisms have division of labor,
which means cells specialize in certain functions. Cells do
not do all the functions of the
body. They only do a certain function.
Multicellular organisms are dependent on each other for the
organism to survive, but if one cell dies the organism can keep living.
https://www.youtube.com/watch?v=N8oP0eKVboc
What are multicellular organisms?
In multicellular organisms, cells perform certain
specialized functions. They
create specialized structure to meet the needs of that
function.
https://www.youtube.com/watch?v=IRbBSlMTSlg
Let’s learn how multicellular organisms form.
In complex multicellular organisms, only the surface cells are in contact with the external environment. Only
surface cells are able to exchange substances with external
environment.
If an elephant did not have a transport system to bring oxygen to the cells deep on the inside of
the elephant, it would die.
A ventilation system would help get the oxygen in to the elephant and a circulatory system would
make sure all the cells inside the elephant receive the oxygen.
In our next lesson we will look at
the circulatory system and
the respiratory system in
multicellular
organisms.
Let’s review what we have learned about survival of unicellular and multicellular
organisms. Answer the attached
questions on the worksheet entitled L#31 Survival part
2.