Marine Biology : Anatomy

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Across
  1. 1. Hole in the top of ocean mammal's head that they breath through
  2. 3. Rigid outer skeleton that provides protection and support
  3. 7. Mix of salt water and fresh water
  4. 8. Keratin filters that whales use to capture small animals like krill when they gulp ocean water
Down
  1. 1. Ability to float in water
  2. 2. Fatty organ in dolphin's head that amplify their echolocation
  3. 4. Flexible limbs that contain stinging cells in jellyfish
  4. 5. Organ that fish use to extract oxygen from the water
  5. 6. Fin on the back of fish and whales that help then keep stability in the water