: something produced in a usually industrial or biological process in addition to the principal product
: a secondary and sometimes unexpected or unintended result
The first one is right, its animals that produce principals that are added to products. Think about it...if you drive a car the tires are made out of hooves ( feet of a animal like cattle, sheep, ect.), make-up is made of fat found in animals. Another by-product is plastic made from corn also know as biodegradable...which means that it can decay by the earth. Hmmm...big words!! I love it! Well time to run! Hope you learned something new today! - Lindsey :)
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