The zipper like mountain ranges the run across the flor of the ocean are called ??

Undersea mountain ranges are mountain ranges that are mostly or entirely underwater, and specifically under the surface of an ocean. If originated from current tectonic forces, they are often referred to as a mid-ocean ridge. In contrast, if formed by past above-water volcanism, they are known as a seamount chain

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.