世界上大多数的海洋沉积物不是含有浮游生物就是含有大量的蕨类孢子，但它们并不是同时存在于同一层中。
Most marine deposits from around the world contain either plankton or a lot of fern spores but not both together in the same layer.
在世界上所有的海洋，包括北冰洋，尾海鞘都是出没在浮游植物密度最大的水域表面。
Found in all the oceans of the world, including the Arctic Ocean, appendicularians tend to remain near the water's surface where the density of phytoplankton is greatest.
上图就是旧金山海湾的一个浮游生物网内聚集的单细胞植物硅藻——这种藻类在世界各大海洋都广泛分布。
The single-celled diatoms below—the likes of which are found in oceans worldwide—were collected with a plankton net in San Francisco Bay.
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