A:
											A community of organisms interacting with one another.
									
																										
										B:
											That part of the Earth which is inhabited by living organisms.
									
																										
										C:
											A community of organisms together with the environment in which they live
									
																										
										D:
											The flora and fauna of a geographical area
									
																								 
							
																
									
										
Explanation
									
									
										
The correct answer is A community of organisms together with the environment in which they live.
Ecosystem : 
It is an interaction of all living and nonliving organisms with the surrounding environment.
The different types of the ecosystem include:
•Terrestrial ecosystem
•Forest ecosystem
•Grassland ecosystem
•Desert ecosystem
•Tundra ecosystem
•Freshwater ecosystem
•Marine ecosystem