If an isotope of some element has a half of 300 years about how much of the isotope will be in sample after 300 years

A half-life is how long an isotope takes to break down. A 300 year half life means that half of the sample will be left after 300 years.

answer: oof wait

explanation:

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.