predator  - A consumer that eats other animals (which are their prey), species - A particular type of plant or animal., reduce - To decrease., pollution - Making the environment dirty with waste products., plankton - Tiny plants and animals that live in the sea., pest - An unwanted plant or animal , such as an insect that eats your flowers., weight - The amount of force that pulls objects towards the Earth., mass - The amount of of matter in an object, measured in kilograms., irreversible - Cannot be changed back to what it was before., solute - The material that is dissolved., soluble - Can dissolve., solution - A mixture of one substance in another, where the dissolved substance can no longer be seen., filtering - A method to separate mixtures made of a solid and liquid using a filter., gravity - The force that pulls objects towards the Earth., newton - The unit used to measure weight., kilogram - Measure of mass equal 1000 g.,

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