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Whether we drive our car across an intersection depends on if the traffic light is red or green, which illustrates the principle of __________.
Phytoplankton
Microscopic plant-like organisms that float in water bodies; they are the primary producers in aquatic ecosystems.
Radioactive Isotope
An isotope of an element that has an unstable nucleus and emits radiation during its decay to a stable form.
Greenhouse Effect
The process by which radiation from a planet's atmosphere warms the planet's surface more than it would without this atmosphere, largely due to greenhouse gases.
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