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

Weather fronts mark the boundary or transition zone between two air masses and have an important impact upon the weather.
In weather terms, the boundary between two air masses is called front.

Being self-luminous makes stars different from planets, moons, asteroids, and comets, all of which shine by reflecting sunlight.
The setmoons, planets, and comets contains only objects that shine as a result of reflected light.

The heart becomes the first working organ in the human body, pumping by rhythmically opening and squeezing shut just 17 days after conception.

In humans, the heart is the first organ to form and become functional.

