Part B: Construct a Dichotomous Key
You will be working with a group of organisms such as snails, birds,
antelopes, rodents, or aquarium fish. You will need to consult reference
books or Web sites that include illustrations.
5. Choose a group of organisms. Then make a list of visible physical traits.



that vary among the species in the group.
6. Choose six or eight species from the group. On a separate sheet of
paper make a simple drawing of each species. Use a letter to label each
drawing. Record the scientific name and common name of each species
next to the appropriate letter below.
A:
B:
C:
D:
E:
F:
G:
H:
7. Use the space on page 113 to construct a dichotomous key for your
group of organisms. Use the key for sharks as a model. Start by
choosing a trait that divides your organisms into two smaller groups.
Keep dividing each of the smaller groups with pairs of statements until
you have a final identifying statement for each of your species.
8. Check the usefulness of your key by making a copy of your key and
asking another student to use it to identify your drawings.







What is the answer of question number 5 and 6