一个自养的单细胞绿藻表现最小程度的特化。
An autotrophic, unicellular, green alga presents the minimum of specialization.
然后在3、4月份出现了蓝——绿藻类这种古老单细胞生物。
Then appeared in the Blue 3,4 - Green algae this ancient single-celled organism.
绿藻门双星藻目一类美丽的单细胞微小绿色藻类，形状差异很大。
Any of a group of one-celled, microscopic green algae characterized by great variation in cell shape.
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