Acompost pile contains decaying organic material. which of these energy sources is formed in a compost pile?
a. electricity
b. biogas
c. coal
d. ethanol

The correct option is B) Biogas

Explanation:

Compost can be described as organic matter that has been decomposed. Methane gas can abundantly be produced by burning compost pile. Methane gas can be used as fuel as it is one of the cleanest gases which can be used. Methane gas is flammable and can be used as a power source in generators to help in the production of electricity. Hence, a compost pile is an effective method to produce biogas. However, this biogas is being used only for small scale uses.  

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )