1. The lemmings and voles are prey for a lot of predators. They are the biggest source of food for carnivores in the forest. They're extinction would have disastrous effects on the ecosystem. What type of species are lemmings and voles for this ecosystem?

Natural selection refers to the procedure where the species get better adapted to their surroundings and seem to produce and survive more offspring. The theory is considered to be the prime procedure, which brings about the process of evolution.

Natural selection needs different traits among the species in a population, which could be passed on or inherited onto the next generation. These distinct traits will modify over the generations or evolve.