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Which is not a vertebrate...

Which is not a vertebrate

A

Oryctolagus

B

Fish

C

Sparrow

D

Amphioxus

Text Solution

AI Generated Solution

The correct Answer is:
To determine which organism is not a vertebrate, we need to understand the classification of animals within the phylum Chordata. Here’s a step-by-step solution: ### Step 1: Understand the Phylum Chordata - The phylum Chordata includes animals that possess a notochord at some stage of their life cycle. The notochord is a flexible rod-like structure that provides support. ### Step 2: Identify Subphyla of Chordata - Chordata is divided into three main subphyla: 1. Urochordata (tunicates) 2. Cephalochordata (lancelets) 3. Vertebrata (vertebrates) ### Step 3: Define Vertebrates - Vertebrates are characterized by having a backbone or vertebral column. This group includes animals such as mammals, birds, reptiles, amphibians, and fish. ### Step 4: Examine the Given Options - The question asks for an example of an organism that is not a vertebrate. Common examples of vertebrates include: - European rabbit (Oryctolagus) - Fish - Sparrow ### Step 5: Identify the Non-Vertebrate - Among the options, if we consider "amphioxus," we find that it belongs to the subphylum Cephalochordata. Amphioxus has a notochord but does not have a vertebral column, which means it is not classified as a vertebrate. ### Conclusion - Therefore, the organism that is not a vertebrate is **Amphioxus**. ### Final Answer - The correct answer is **Amphioxus**. ---
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