海藻包括小到单细胞有机体、大到巨型褐藻的多种类型植物，有些海藻生长于海面附近，依赖氮元素成长。
Algae range in size from single-celled organisms to giant kelp plants. Some live near the surface of the ocean, and these algae need nitrogen to grow.
动植物死亡后，被微生物分解；黏菌随后会吞食掉许多细菌，释放出他们的营养物质供其他有机体生长。
When plants and animals die, microbes break them down; slime molds then devour many of the bacteria, releasing their nutrients for other organisms to grow on.
有机体是任何大小的有生命的植物或动物。
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