A population of birds lives on a mountain. In this population, there are red-winged birds, orange-winged birds, and blue-winged birds. A predator eats more of the blue-winged birds because they are not well camouflaged on the red and orange plants that grow on the mountain. This is an example of which mechanism of evolution? a. Natural selection
b. Gene flow
c. Sexual selection
d. Genetic drift

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.