algae are used in wastewater treatment facilities, reducing the need for greater amounts of toxic chemicals than are already used. algae can be used to capture fertilizers in runoff from farms. when subsequently harvested, the enriched algae itself can be used as fertilizer.
paper bags can decompose in the environment in about a month meanwhile plastic can take hundreds of years. plastic is harmful in many other ways too, for instance they release toxic chemicals into the earths soil and land and sea creatures can get caught in plastic or eat it and later die.
gene mutations can best be described as changes in the (3) nucleotide base sequence in dna.