For this assignment you will describe and draw your
planet's earliest life forms.
Think about the life forms you are planning to have
so that you will be sure to have a good place for them to live!
you are making web pages,
be sure to check Rubric
4 for information on how to create this page.
you are in the
check your rubric
Your page should deal with the following topics:
1. The Environment
Where did life begin on your planet? Possibilities on earth
include the deep sea, volcanic eruption zones, and shallow seas.
2. Describe Your Early Life Forms
You and your group will work together to plan what your life
forms will look like, how they will function, and how they will
get energy. Remember that on earth there are three groups of
life forms: primary producers, who synthesize their own food
plants in complex
organisms), consumers who eat the primary producers and each other
called animals if
they are complex
organisms). and decomposers, who recycle dead organic material
by breaking it down into simple chemical compounds that the primary
producers can use. (Fungi, soil bacteria, etc)
decomposers are also
because they are
dependent on primary
producers to make
the food that they
Energy capture is necessary for survival.
3. Describe Development and Adaptation of Your Life
Your single celled life forms will develop in a stable and
well defined environment. Eventually they will have opportunities
to diversify into other environments with different temperatures
and slightly different water
chemistry. They will develop into
organisms with different shapes and sizes. They will develop
ways to move, reproduce, and capture energy. Some may even combine
to make an organism with better survival prospects. Play with
the ideas a little bit and see what you come up with. Check out
In the Details: Variation Among Unicellular
Life Forms for some examples from Planet Earth. Make
a chart that shows a parent species and some life forms that
could have descended from it. Describe how the changes in the
new species aid their survival.
4. How Your Life Forms Reproduce and Survive
Life forms must be able to reproduce themselves. Describe
how your life forms replicate themselves. Do they have some way
to survive dangerous changes in their environment?
5. Describe Senses and Behaviors that Enhance Survival
Unicellular organisms don't have "senses" as we
understand the word, but they are sensitive to their environments.
Their cell walls allow some chemicals to pass into the cell and
keep other chemicals out. Some of these tiny
organisms will move
toward light. What information do your life forms gather from
Add links to Chapter Five and to the Table of Contents.
Header by Viau from Yellowstone
1996,1997, 1998, 1999,
2000, 2002, 2003.
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