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| alga Simple, green, aquatic plants without stems, roots or leaves. They are among the microscopic organisms that form the start of the food chain. Algae are found floating in the sea and fresh water, but they also grow on the surface of damp walls, rocks, the bark of trees and on soil. They contain chlorophyll and other pigments that let them grow by photosynthesis. On land, algae can be useful in improving the fertility of soil by nitrogen fixation; alga | |||
| algae (Algae) | |||
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| horsetail tang (Sargassum enerve); sea trumpet (Eisenia bicyclis) | |||
| algae | |||
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| weeds condiment | |||
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algas : 81 短语, 15 学科 |
| 一般 | 4 |
| 养鱼（养鱼） | 8 |
| 农业 | 18 |
| 化学 | 1 |
| 医疗的 | 2 |
| 卫生保健 | 1 |
| 地球科学 | 2 |
| 机械工程 | 2 |
| 法律 | 2 |
| 环境 | 15 |
| 生命科学 | 5 |
| 自然科学 | 11 |
| 自然资源和野生动物保护 | 7 |
| 运输 | 1 |
| 食品工业 | 2 |