Most chordates have which type of skeleton?Multiple choice question.ExternalInternalLack a skeletonChitinous

1. Break Down the Problem

We need to determine the type of skeleton that most chordates possess. The options are:

1. External
2. Internal
3. Lack a skeleton
4. Chitinous

2. Relevant Concepts

Most chordates belong to the subphylum Vertebrata, which are characterized by having an internal skeleton made of bone or cartilage.

3. Analysis and Detail

• External Skeleton: This is typically found in some invertebrates, not chordates, such as insects or crustaceans.
• Internal Skeleton: Chordates including mammals, birds, reptiles, amphibians, and fish all possess an internal skeleton (endoskeleton).
• Lack a Skeleton: While some chordates, like tunicates, may lack a traditional skeleton as adults, they do possess an internal structure in their larval stage.
• Chitinous: Chitin is mainly found in invertebrates and not typical in chordates.

4. Verify and Summarize

Given the characteristics of chordates, the most accurate answer among the provided options is that most chordates have an internal skeleton.

Final Answer

Internal