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plants tend to grow in the direction that gravity pulls them (roots of plants grow down into the soil)
when the pollen from one flower is used to fertilize the eggs produced by that same flower (true-bred flowers)
sexual, nonvascular, have spores, near water so that sperm can swim to reach eggs and fertilize them
sexual, vascular, have spores, require at least a thin film of water so sperm can reach eggs
sexual, vascular, have seeds, does not require water for fertilization, reproduces through pollination, also called gymnosperms
sexual, vascular, have seeds, does not require water, reproduces through pollination, has flowers and seeds, also called angiosperms
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