Testable, Does increasing light intensity increase the rate of photosynthesis in pondweed?, Does fertiliser concentration affect the biomass of radish plants after 4 weeks?, Does exercise increase resting heart rate recovery time in humans?, Does soil pH affect the rate of seed germination in cress seeds?, How does antibiotic concentration affect bacterial colony size on agar plates?, Does increasing CO₂ concentration increase the rate of photosynthesis in algae?, Will changing the salinity affect osmosis in potato tissue?, How does light wavelength affect the rate of transpiration in plants?, Does enzyme activity increase with temperature up to an optimum point?, Non-testable, Are humans the most important species on Earth?, Do animal behave differently when they feel safe?, Is intelligence the most important trait for survival?, Are ecosystems more beautiful when they are diverse?, Do all organisms want to survive?, Is Pollution is bad for living things?, Did humans evolve because they needed to become more intelligent?, Does nature always find a balance?, Does stress make the immune system weaker?, Do plants grow better when they are happy?.

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