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Which of the following statements about the flatworms is false?
Envelopes
Paper or plastic enclosures used for sending letters, documents, or other items, sealed at one end with an opening at the other.
Watermark
A recognizable image or pattern in paper or digital form that appears as various shades of lightness/darkness, used to identify authenticity and prevent counterfeiting.
Photo-sensitive Mark
A type of indicator or feature on an object that changes its appearance in response to light exposure.
Clasp Envelopes
Envelopes that feature a metal clasp for closure, used to securely hold documents.
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