Extensive property means and explain example of extensive property.

Extensive property is a property of matter that changes as the amount of matter changes.  

Explanation: An extensive property is explained as a property changes as the amount of matter changes and it is measured without any chemical change occurring. For example mass and volume are extensive properties. As more matter is added to a system, mass and volume both changes. It basically do not depend on the size of the system, nor the amount present  in the system.  

answer: eco and eco system

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assault rifle is a rapid-fire, magazine-fed rifle designed for military use. it is a shoulder-fired weapon that allows the shooter to select between semi-automatic (requiring you pull the trigger for each shot), fully automatic (hold the trigger and the gun continuously fires) or three-shot-burst modes.