Mutation results in new gene types, the new trait made by the gene; makes variation of two humans. Keep in mind, no two humans are the same; all humans have different heights, appearances and genes. The gene is passed down by sexual reproduction for generations; that is until a recessive( rare) gene appears in a child, then it passes on. This is never ending; and can be applied to dominant (most common) genes also. You're Welcome!
As the Earth warms, scientists worry that some of the carbon in permafrost could escape to the atmosphere as carbon dioxide or methane. Increasing the amount of these gases in the atmosphere could make Earth's climate & more
