Which of the following concepts is best demonstrated by this experiment?

(A) Populations with higher genetic variation can withstand droughts better.
(B) Meteorological impacts will affect the evolution of populations.
(C) Environmental changes can affect all the levels of the ecosystem.
(D) Unoccupied biological niches are dangerous because they attract invasive species.

The rainfall and biomass of several trophic levels in an ecosystem were measured over several years. The results are shown in the graph below.

Transcribed Image Text:

Rainfall and Biomass 2005-2011 120 Rainfall (inches) 100 807 60 40 20 0 2005 2006 2007 2008 2009 2010 2011 500 450 400 350 300 250 200 150 100 50 0 Biomass