Question

1. use the dichotomous key below to identify the following organisms. write their name on the line beneath its corresponding picture.

1a backbone go to 2
1b no backbone go to 5
2a wings sammy
2b no wings go to 3
3a legs go to 4
3b no legs carl
4a shell larry
4b no shell pete
5a antenna kevin
5b no antenna chester

Explanation:

Step1: ID Organism 1 (Snake)

1. 1b: No backbone? No, snake has backbone → Go to 2.
2. 2b: No wings → Go to 3.
3. 3b: No legs → Carl

Step2: ID Organism 2 (Lizard)

1. 1a: Has backbone → Go to 2.
2. 2b: No wings → Go to 3.
3. 3a: Has legs → Go to 4.
4. 4b: No shell → Pete

Step3: ID Organism 3 (Turtle)

1. 1a: Has backbone → Go to 2.
2. 2b: No wings → Go to 3.
3. 3a: Has legs → Go to 4.
4. 4a: Has shell → Larry

Step4: ID Organism 4 (Spider)

1. 1b: No backbone → Go to 5.
2. 5b: No antenna → Chester

Step5: ID Organism 5 (Ant)

1. 1b: No backbone → Go to 5.
2. 5a: Has antenna → Kevin

Step6: ID Organism 6 (Bat)

1. 1a: Has backbone → Go to 2.
2. 2a: Has wings → Sammy

Answer:

1. Carl
2. Pete
3. Larry
4. Chester
5. Kevin
6. Sammy