C. Biotic and Abiotic Factors/ keystone species

• Biotic and Abiotic Factors

-Biotic factors are living things and each organism plays a particular role in the ecosystem.

For example: plants, worms, tree and moss/bacteria on trees are
biotic factors.

-Abiotic factors are nonliving things which balance of determines which living things can survive in a particular environment

For example: moisture, temperature, wind, sunlight and soil are abiotic factor

• Biodiversity-variety of life within an area
-This picture is an example of biodiversity because it shows variety of different lives living in a certain area. There are flowers, moss, tree, branches and vines. 

• keystone species and how a beaver is an example
  -A keystone species is a species that has an unusually large effect on its ecosystem.
  -By felling trees to construct dams, beavers change free-flowing stream habitats into ponds, wetlands, and meadows.
  -This modification leads to a cascade of changes within their ecosystem.