Solved LAB ACTIVITY-CREATING A DICHOTOMOUS KEY TO IDENTIFY | Chegg.com - Free Printable

Problem Description:

The task is to create a dichotomous key to identify the animals shown in the image. A dichotomous key is a tool used for identifying organisms by making a series of choices between two options at each step. The goal is to systematically narrow down the possibilities until the correct organism is identified.

Solution Approach:

1. Understand the Dichotomous Key Concept:
- A dichotomous key works by presenting a series of binary (two-choice) questions about the characteristics of the organism.
- Each choice leads to further questions or directly to the identification of the organism.

2. Identify Key Characteristics:
- Group animals based on broad categories (e.g., vertebrates vs. invertebrates, aquatic vs. terrestrial, etc.).
- Use specific traits like body structure, habitat, presence of limbs, wings, scales, etc.

3. Create the Key:
- Start with the most general distinguishing feature.
- Progress to more specific features as you narrow down the options.

Step-by-Step Solution:

#### Initial Split: Vertebrates vs. Invertebrates
- Question 1: Does the animal have a backbone (vertebrate)?
- Yes → Go to Question 2.
- No → Go to Question 8.

#### Vertebrates (Backbone Present)
- Question 2: Is the animal an amphibian (typically lives in water and land, has moist skin)?
- Yes → Frog (Animal 2).
- No → Go to Question 3.

- Question 3: Is the animal a reptile (scales, cold-blooded)?
- Yes → Go to Question 4.
- No → Go to Question 5.

- Question 4: Does the reptile have a shell?
- Yes → Turtle (Animal 3).
- No → Lizard (Animal 4).

- Question 5: Is the animal a bird (feathers, beak)?
- Yes → Chickadee (Animal 5).
- No → Go to Question 6.

- Question 6: Is the animal a mammal (fur, warm-blooded)?
- Yes → Go to Question 7.
- No → Snake (Animal 6).

- Question 7: Does the mammal have antlers?
- Yes → Moose (Animal 9).
- No → Fox (Animal 8).

#### Invertebrates (No Backbone)
- Question 8: Does the animal have wings?
- Yes → Butterfly (Animal 1).
- No → Grasshopper (Animal 7).

Final Identification:

- Squirrel (Animal 10): Not explicitly covered in the initial split but can be added as a mammal without antlers after Question 7.
- Toad (Animal 11): Can be added as another amphibian after Question 2.

Complete Dichotomous Key:

1. Does the animal have a backbone (vertebrate)?
- Yes → Go to Question 2.
- No → Go to Question 8.

2. Is the animal an amphibian (typically lives in water and land, has moist skin)?
- Yes → Frog (Animal 2).
- No → Go to Question 3.

3. Is the animal a reptile (scales, cold-blooded)?
- Yes → Go to Question 4.
- No → Go to Question 5.

4. Does the reptile have a shell?
- Yes → Turtle (Animal 3).
- No → Lizard (Animal 4).

5. Is the animal a bird (feathers, beak)?
- Yes → Chickadee (Animal 5).
- No → Go to Question 6.

6. Is the animal a mammal (fur, warm-blooded)?
- Yes → Go to Question 7.
- No → Snake (Animal 6).

7. Does the mammal have antlers?
- Yes → Moose (Animal 9).
- No → Fox (Animal 8).

8. Does the animal have wings?
- Yes → Butterfly (Animal 1).
- No → Grasshopper (Animal 7).

Final Answer:

$$
\boxed{
\text{See the detailed dichotomous key above.}
}
$$