49.
									
										Pioneer seral communities of succession are characterized by 
									
								
															
														
																									
										A:
											Low species diversity, short life cycle, r-strategist
									
																										
										B:
											 Low species diversity, narrow niche specialization, predominant detritus food chain 
									
																										
										C:
											High species diversity, broad niche specialization, predominant grazing food chain 
									
																										
										D:
											Low species diversity, long life cycle, k-strategist
									
																								 
							
																
									The answer is:
										A