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The organisms require nutrient-rich water with temperatures between 6 and 14 °C (43 and 57 °F). They are known for their high growth rate—the genera Macrocystis and Nereocystis can grow as fast as half a metre a day (that is, about 20 inches a day), ultimately reaching 30 to 80 metres (100 to 260 ft). [7]
Typical flow speeds in the ocean are around 0.1 m s −1, generally one to two orders of magnitude weaker than typical atmospheric flows (1–10 m s −1), that can limit dispersal. [52] However, as seawater density is approximately 1000 times greater than air, momentum of a moving mass of water at the same speed is three orders of magnitude ...
Seagrasses evolved from terrestrial plants which recolonised the ocean 70 to 100 million years ago. The name seagrass stems from the many species with long and narrow leaves , which grow by rhizome extension and often spread across large " meadows " resembling grassland ; many species superficially resemble terrestrial grasses of the family ...
Weighing just about 23 kilograms (50 pounds), Grasshopper – adorned with pink skis, a few cameras and a lot of tech – can currently plant up to 60 seeds per minute and can hold up to 20,000 ...
The "snowflakes" grow over time and may reach several centimetres in diameter, travelling for weeks before reaching the ocean floor. However, most organic components of marine snow are consumed by microbes , zooplankton and other filter-feeding animals within the first 1,000 metres of their journey, that is, within the epipelagic zone.
Marine botany is the study of flowering vascular plant species and marine algae that live in shallow seawater of the open ocean and the littoral zone, along shorelines of the intertidal zone, coastal wetlands, and low-salinity brackish water of estuaries. It is a branch of marine biology and botany.
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