1. Something in addition to what is due, expected, or customary; something in addition to the regular charge or compensation, or for which an additional charge is made; as, at European hotels lights are extras.
2. (Science: prefix) without, outside of.
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There are many environmental factors that arise due to the usage of water in one way or another and for every action that man does, there is a resultant effect on the ecosystem. In this tutorial, some scenarios where human action results in a response from the ecosystem, either physically or chemically, are described. ..