Density-dependent and density-independent factors can impact population size. Examine the two graphs below. a. Figure A shows changes in a seagull population over six years (red line) and also the variation in "Factor X," which is also being studied (gray line). Based on the pattern observed, is "Factor X" more likely to be a density-dependent or a density-independent factor? Explain your answer. [4 pts] b. Figure B shows the changes in an Irish sheep population over 100 years. Are the changes in the sheep population likely due to density-dependent or density-independent factors? Explain. [3 pts] c. The Deepwater Horizon oil tanker blowout in 2010 led to the spilling of ~5 million barrels of crude oil into the Gulf of Mexico 80 km off the Louisiana coast. As a result, there was a 65% reduction in salt marsh plant populations. Is this an example of a density-dependent factor? Explain. [2 pts] Figure A Figure B Seagulls 3 1 1 3 L 1860 Factor X 2006 2007 2008 2009 2010 2011 2012 Year 1960 Year