Excess fertilizer enters a lake, causing fish deaths. What is the main reason?, Increased oxygen, Oxygen depletion due to decomposition of algae, Increased predators, Increased biodiversity, If frogs disappear from a grassland ecosystem, what is the most likely result?, Grasshoppers increase and snakes decrease, Grasshoppers decrease, Eagles disappear immediately, Snakes increase, A medicinal plant may be useful for developing future drugs. Which biodiversity value does this represent?, Social value, Ethical value, Option value, Tourism value, Destroying a mangrove forest will mainly affect which biodiversity values?, Aesthetic only, Productive only, Ethical only, Tourism, ecosystem services, and social values, Why is the energy pyramid always upright?, Biomass increases upward, Energy is lost as heat at each trophic level, Producers consume less energy, Carnivores store all available energy

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