Time is a dimension in which events happen in sequence, moving from the past through the present toward the future. It can be measured using the movement of objects like the sun and moon, and is divided into seconds, minutes, hours, days, and years.

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Dinosaurs went extinct about 66 million years ago, most likely due to a massive asteroid impact combined with volcanic activity that changed Earth's climate. The collision and its aftermath made it impossible for dinosaurs to survive.

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Life on Earth began roughly 3.5 to 4 billion years ago through chemical processes that created simple single-celled organisms in Earth's early oceans. Scientists believe non-living chemicals gradually organized into living cells through natural processes, though the exact steps are still being studied.

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Climate change is the long-term shift in Earth's average temperature and weather patterns, primarily caused by human activities that release greenhouse gases into the atmosphere. These gases trap heat from the sun and warm the planet, leading to changes in weather, sea levels, and ecosystems.

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Democracy is a system of government where power ultimately rests with the people, who exercise that power either directly or through elected representatives. It matters because it protects individual freedoms, ensures peaceful transfers of power, and allows citizens to have a voice in decisions that affect their lives.

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