Determine these 3 example that which mechanism of evolution it involves: Natural Selection, Genetic Drift (Founder’s Effect or Bottlenect Effect), Sexual Selection, or Gene Flow.

1-A volcanic eruption causes lava to flow down the slide of a mountain that is the habitat for a population of sloths. Being slow, the sloths are unable to outrun the approaching lava flow and die. A few sloths were in trees not burned by the lava flow and survived. These sloths are the last of their kind in this region of the rainforest.
2-The male bowerbirds of create elaborate mosaics of flowers, fruit and other colorful artifacts to attract a mate to their nest.
3-The Amish traditionally only marry within their communities. As a result, the rate of polydactyly, a genetic disorder that causes having extra fingers, is unusually high within this population.