Cell theory and submarine: what they have in common

1. Step 1. Cell theory — uses — Microscope. Observing cells.
2. Step 2. Microscope — includes — Operating microscope. A microscope.
3. Step 3. Operating microscope — is used in — Lens replacement. Under a microscope.
4. Step 4. Lens replacement — uses — Ultrasound. Phacoemulsification.
5. Step 5. Ultrasound — is used in — Sonar. Ultrasonic pulses.
6. Step 6. Sonar — is part of — Submarine. Underwater acoustics.

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