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

A neutral atom has an equal number of protons and electrons so that the positive and negative charges exactly balance.
Because atoms have equal numbers of positive protons and negative electrons, they possess a neutral charge.

All matter is composed of basic elements that cannot be broken down to substances with different chemical or physical properties.
All matter in the universe is composed of one or more unique pure substances called elements.

Fins are used by fish to move through the water but also to  steer, stop and maintain their position, the latter in conjunction with  the swim bladder.

Fish use some of their fins to propel themselves through the water and some of their fins to steer.