It is always working.
It even works while the person is sleeping to push saliva down the throat.
Answer:
Bacteria are microorganisms and they are useful to us. Bacteria are economically important as these microorganisms are used by humans for many purposes. The beneficial uses of bacteria include the production of traditional foods such as yogurt, cheese, and vinegar. Microbes are also important in agriculture for the compost and fertilizer production. Bacteria are used in genetic engineering and genetic changes.
I found some articles on the internet that may be helpful (took me three minutes of searching). Hope these help?
http://www.huffingtonpost.com/ravishly/neuroscience-proves-what-_b_6494820.html
http://sitn.hms.harvard.edu/flash/2016/gender-lines-science-transgender-identity/
Answer:
Ur welcome ;) (Even tho I uploaded it from the web lol)
Explanation: