Life science is the study of living things, from large ecosystems down to tiny cells. It begins with biomes, which are large regions with similar climates, plants, and animals, including terrestrial and aquatic biomes. Organisms in each biome have adaptations that help them survive, and energy connects all living things through food chains, food webs, and energy pyramids, starting with producers and moving to consumers.
Life is built from cells, the smallest units of life. Cells contain organelles such as the nucleus, mitochondria, cell membrane, and vacuole, which work together to keep the cell functioning. Cells grow and reproduce through the cell cycle, including interphase and the stages of mitosis. Inside the nucleus is DNA, which carries instruc…
Life science is the study of living things, from large ecosystems down to tiny cells. It begins with biomes, which are large regions with similar climates, plants, and animals, including terrestrial and aquatic biomes. Organisms in each biome have adaptations that help them survive, and energy connects all living things through food chains, food webs, and energy pyramids, starting with producers and moving to consumers.
Life is built from cells, the smallest units of life. Cells contain organelles such as the nucleus, mitochondria, cell membrane, and vacuole, which work together to keep the cell functioning. Cells grow and reproduce through the cell cycle, including interphase and the stages of mitosis. Inside the nucleus is DNA, which carries instructions for life and allows traits to be passed from parents to offspring, a process called heredity, studied in genetics.
Living things are organized in levels—from cells to tissues, organs, organ systems, and organisms. Scientists classify life into six kingdoms. The human body shows this organization through systems that work together to keep us alive. Finally, life on Earth changes over time through evolution by natural selection, explaining the diversity of life as populations adapt across generations.
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