You are given a sentence and your task is to generate another sentence that supports the given input.

Example Input: The leaf has veins in it that allow for the transport of water, nutrients and sugars through the rest of the plant.
Example Output: Leaves export sugar to roots and other nonphotosynthetic parts of the plant through the veins.

Example Input: The Sun's gravity is what keeps the planets in orbit.
Example Output: Gravity is responsible for the orbits of the planets around the sun.

Example Input: Backflow of blood in the heart is prevented by four valves made of flaps of connective tissue.
Example Output:
Heart valves prevent the backflow of blood from happening in the heart.

