定義： A 1D measurement of a single cell along its longest axis. Typically, this is the distance along a straight line connecting the anterior-most point and the posterior-most point.
定義： An aquatic biome that comprises systems of open-ocean and unprotected coastal habitats, characterized by exposure to wave action, tidal fluctuation, and ocean currents as well as systems that largely resemble these. Water in the marine biome is generally within the salinity range of seawater: 30 to 38 ppt.
