Invasive species are usually defined as those species which, when introduced into an ecosystem becomes dominant at a faster rate. They does not belong to the native ecosystem.It directly affects the existing biodiversity in the marine as well as the aquatic ecosystem. For example, Zebra mussels, Burmese python and Green crab.
These species are sometimes added into the marine and other aquatic ecosystem due to the releasing of the ballast water through the ships in the oceans, and it takes place either intentionally or accidently.
If the grade of the ore is 37.3% nickel, then the unknown quantity to get 10 grams of nickel is 0.373 x = 10 grams or x = 10/0.373=26.8 grams or 0.0268 kg needed to dig up to recover the 10 grams of nickel. At this grade of ore, 1 kilogram would yield 373 grams of nickel.
