An is a pure substance that is only made up of one kind of atom

What is the "great pacific garbage patch"? a large area of marine debris concentrated by rotating ocean currents a large area around the pacific rim where debris collects from natural disasters such as tsunamis an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability a large trash dump located in hawaii

Long term exposure to waves can cause sunburns and skin cancer.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.