Answer:
A raindrop splits in half as it falls through the atmosphere.
Explanation:
The statement saying "All cells come from pre-existing cells" means that all cell undergoes cell division to form a new cell.
The best example that demonstrates this statement is "A raindrop splits in half as it falls through the atmosphere because a raindrop or cell divides into half and creating new cells. The cells are able to split as they have duplicated cells before cell division and split into half or more to form a new cell from an existing cell.
Hence, the correct answer is "A raindrop splits in half as it falls through the atmosphere."