The water hyacinth was a major weed in Australian and overseas' waterways until biological control
was used. Looking at the photo below, what
impact would this weed have on biodiversity in the
waterways it infests?

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Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.