A DICHOTOMOUS KEY

ant.jpg (20411 bytes)

1.

 crayfish.jpg (14302 bytes)

2.

 forg.jpg (64918 bytes)

3.

 grouper.jpg (11277 bytes)

4.

 jellyfish.gif (8263 bytes)

5.

 lesserscaup.jpg (14033 bytes)

6.
snail.jpg (5713 bytes)

7.

 snake.jpg (75992 bytes)

8.

 spider.jpg (30510 bytes)

9.

 tiger.gif (69697 bytes)

10.

 urchin.jpg (67067 bytes)

11.

 worm.gif (25925 bytes)

12.


1.a. External nostrils present ... go to 2 
1.b. No external nostrils present ... go to 6

2.a. Breathes air ... go to 3 
2.b. Breathes in water using gills ... FISH

3.a. Has no fur or hair ... go to 4 
3.b. Has fur or hair ... go to MAMMAL

4.a. Has feathers ... go to BIRDS  (Order: Aves)
4.b. Has no feathers ... go to 5

5.a. Has scales ... REPTILE 
5.b. No scales, smooth skin ... AMPHIBIAN

6.a. Has an external skeleton or a shell ... go to 7 
6.b. Has no external skeleton ... go to 11

7.a. Body divided into segments ... go to 8 
7.b. Body not divided into segments ... go to 10

8.a. Body divided into 3 parts, has three pairs of legs ... INSECT 
8.b. Body divided into two parts ... go to 9

9.a. Has four pairs of jointed legs ... ARACHNID
9.b. Has five or more pairs of legs ... CRUSTACEAN

10.a. Soft body covered with a shell ... MOLLUSK
10.b. Body covered with spines ... ECHINODERM

11.a. Soft body divided into segments ... ANNELID

11.b. Soft body, no segments ... CNIDARIAN

 

BACK~