1. A healthy food web has an abundance of autotrophs, many herbivores and few carnivores and omnivores. 2. When an herbivore eats a plant or other autotroph that is covered in pesticides, for example, those pesticides are stored in the animal's fat. 3. By the time the tuna is consumed by people, it may be storing a remarkable amount of bioaccumulated toxins. 4. Biomass shrinks with each trophic level due to the fact that 80 to 90 percent of an organism's energy, or biomass, is lost as heat or waste. Which two sentences taken together provide the BEST evidence to support the idea that the bottom of the food chain can directly affect the top of the food chain? (A) 1 and 2 (B) 2 and 3 (C) 3 and 4 (D) 1 and 4