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Similar to grasses on land, seagrass shoots are connected underground by a network of large root-like structures called rhizomes.
The rhizomes can spread under the sediment and send up new shoots.
Algae or "seaweeds" (left) differ from seagrasses (right) in several ways.
Seagrasses have roots, stems and leaves, and produce flowers and seeds.From Seagrasses grow both vertically and horizontally—their blades reach upwards and their roots down and sideways—to capture sunlight and nutrients from the water and sediment.They spread by two methods: asexual clonal growth and sexual reproduction.When this happens, many stems within the same meadow can actually be part of the same plant and will have the same genetic code—which is why it is called clonal growth.In fact, the oldest known plant is a clone of the Mediterranean seagrass , which may be up to 200,000 years old, dating back to the ice ages of the late Pleistocene.