Ecosystems quiz
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Which kind of species is named after an arch's top stone?
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More questions about Ecosystems
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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What trophic level is a person who eats only fruit?
Answer: Level 2
Why: Humanity's average trophic level is about 2.2, the same as pigs and Peruvian anchovies.
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Which sea otter prey would otherwise strip kelp forests bare?
Answer: Sea urchins
Why: Where otters were hunted out, urchins grazed kelp forests down to bare seafloor called urchin barrens.
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Which predator's removal cut a rocky shore's species from 15 to 8?
Answer: Sea star
Why: Without the sea stars, mussels spread unchecked and crowded the other species off the rocks.
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Dust from which desert fertilizes the Amazon rainforest?
Answer: Sahara
Why: About 22,000 tons of phosphorus arrive this way each year, roughly what the Amazon loses to rain and floods.
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How do food chains at deep-sea vents get their energy?
Answer: Chemosynthesis
Why: Giant tube worms at the vents have no mouth or gut; bacteria living inside their bodies make their food.
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Why did the oxygen inside Biosphere 2 run low?
Answer: Soil microbes
Why: The oxygen inside fell from about 21% to 14.5%, and extra oxygen had to be pumped in.
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