QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
1. How many pairs of appendages does a human have?
2. 1001
3. Crayfish?
4. Grasshopper?
5. Bird?
6. Frog?
7. Sea anemone?
# EXERCISE II: IDENTIFICATION OF ANIMALS USING A KEY
A dichotomous key is a tool to help you identify the animal you are looking at. In order to use the key, always start at step 1. Each step will give you two options 1A or 1B and you will choose the option that best describes the animal. Follow the directions from there to the next step and choose the best option for your specimen until you end with a choice that names the phylum of your animal.
Using the key provided, identify the 9 animals we have been studying. List the phylum for each in the latest provided below. If you key an organism to either the phylum Arthropoda or Chordata, proceed to the appropriate key to classes and determine the class for the specimen.
1. Sea Star:
2. Clam:
3. Frog:
4. Crayfish:
5. Ascans:
6. Grasshopper:
7. Sea anemone:
8. Fish:
9. Earthworm:
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Step 1I'll solve this problem in 3 parts:
Part 1: Identifying the number of appendage pairs in humans and various animals. Part 2: Creating a simplified dichotomous key for the given animals. Part 3: Using the key to identify the phylum of each animal. **Part 1: Appendage pairs in humans and animals**
Step 2
Humans have 2 pairs of appendages: 2 arms and 2 legs.
Final Answer
1. Sea Star: Phylum Echinodermata 2. Clam: Phylum Mollusca 3. Frog: Phylum Chordata, Class Amphibia 4. Crayfish: Phylum Arthropoda, Class Malacostraca 5. Ascidians: Phylum Chordata, Class Ascidiacea 6. Grasshopper: Phylum Arthropoda, Class Insecta 7. Sea anemone: Phylum Cnidaria 8. Fish: Phylum Chordata, Class Actinopterygii or Chondrichthyes 9. Earthworm: Phylum Annelida
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