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What is a Plant? MOST PLANTS are green because they contain the substance chlorophyll. They use it to trap light energy; this is used during photosynthesis to make food. Plants are usually anchored in a growing medium such as soil. Some, such as mosses and liverworts, are small and delicate. Others, such as the giant redwood trees, are huge. Many plants, such as marigolds and sunflowers, are annuals, which means that they live for just a year. Perennials can live for many years: some bristlecone pine trees, for example, are nearly 5,000 years old. Rainforest vegetation Where a plant lives depends on its growing requirements. Plants of the rainforest, for example, need its humid climate in order to survive and grow. Flowering Plants FLOWERING plants, known as angiosperms, are the most widespread of all plants. Using flowers to reproduce has contributed to this success. Flowers carry the reproductive organs within a ring of petals. After...

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