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At some point, robots are essential in our life since robots are made to make our lives easier but it also has disadvantages, a good example of this is the contribution of modern technology to our environment. As people's life gets easy, the air that we breathe gets dirty unless we make robots that has the ability to purify air.
Here are some of the things that robots do to help humans:=- Dismantle bombs==- Making cars==-Packing boxes==-Helping the army==-Used in labs==-Underground mining=
i thike some robots will help people in our homes
Some robots are very expensive costing millions of dollars. Some robots are very cheap and cost less than 10 dollars.
No it is not necessary that all robots have arms and legs. Some robots have only arms and some have legs and some have wheels for their mobility. Basically it depends on the requirements as the requirements dictate how we design our robots. For example in automobile industries robots are used only for welding purposes or in paintshop. These types of robots have only arms not legs.