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

Biomass is a renewable energy resource for power generation using combustion, gasification or co-firing.
Biomass is an example of a renewable energy resource.

Sperm cells are usually motile, having a single flagellum .
In humans, the sperm cell is the only cell with the  flagella structure that enables motility.

Exposure to radiation or cancer-causing chemicals may cause DNA  mutations in many organs, but these factors have not been proven to be important causes of mutations in prostate cells.

Cancer is caused by mutations, which can be caused by pathogens, chemicals, or radiation.

