charity – n. the act of giving money, food, or other kinds of help to people

recycle – v. to make something new from something that has been used

filter – v. to pass something like a liquid through a filter to remove something unwanted

option – n. the opportunity to choose something or to choose between two or more things

desalination – v. to remove salt from something like water

plant – n. a building or factory where something is made

membrane – n. a thin sheet or layer

enzyme – n. a chemical substance in animals and plants that helps to cause natural processes

nanoparticle – n. a microscopic particle whose size is measured in nanometers

honeycomb – n. a group of wax cells with six sides that are built by honeybees in their hive and that contain young bees or honey

allocate – v. to divide and give out something for a special reason or to particular people, companies, etc.
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