Why would a sea turtle eat a plastic bag?

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Across
  1. 5. a part of the body (eyes, ears, nose, mouth, hands) that gathers information about the environment
  2. 6. a behavior that is learned based on past experiences
  3. 7. the actions and reactions of living things
Down
  1. 1. a behavior that a living thing does without being taught
  2. 2. information that is stored in the brain and can be remembered
  3. 3. a part of the body that receives and responds to signals from the senses and also stores memories
  4. 4. a pretend version of something