Which term names an ecological system with all its biotic and abiotic factors?

a. habitat

b. community

c. ecosystem

d. pure culture

C.

Explanation:

In an ecosystem you have all the factors that contribute to a population of a variety of organisms. You have wind, water or sun as some abiotic factors which in turn help plants and trees survive with sustain different species.  

preservation because he preserves part of the land and preserves means save

explanation:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.