I wish you added the diagram but I can tell that the long strings are the spindle fibres.
Answer:
Movement in some flatworms is controlled by longitudinal, circular, and oblique layers of muscle
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The four laws or principles that are involved with the study of Stratigraphy are the following:
1. Principle of original horizontality
2. Law of superposition
3. Law of crosscutting relationships
4. Principle of Lateral Continuity
5. Principle of Faunal Succession
6. The Law of inclusions
Therefore, the correct answers would be 1, 2 and 4. Hope this answer helps.