Answer:
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
Beautiful girls strut and sexy men 'do their little turn' on this.
Only two backbones and thousands of ribs.
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
Feed me and I live, give me drink and I die.
Lynn likes grapes but not potatoes. She likes squash but not lettuce, and she likes peas but not onions. Following the same rule, will she like pumpkins or apples?