Question

WHAT IS MANUFACTURING?
WHAT IS BIO GAS?​

Answer 1

Manufacturing

to make something in large quantities using machines.

Biogas

mixture of methane and carbon dioxide produced by the decomposition of plant and animal waste, that is used as fuel

Answer 2

Here is ur answer mate,

Manufacturing is the making of goods by hand or by machine that upon completion the business sells to a customer. 

Biogas is the mixture of gases produced by the breakdown of organic matter in the absence of oxygen, primarily consisting of methane and carbon dioxide.

Hope it helps....✌️✌️