同程系统的稳定性总体上不如异程系统。
总体来讲，花粉没有大的演化分异，只是表面纹饰和花粉大小有一定的差异。
Except for some differences in exine ornamentation and pollen size, there is no great evolutionary divergence among genera in pollen morphology.
总体来说，水体中异养微生物数量大，而自养微生物数量小。
Generally, there are large amounts of heterotrophic bacteria and small amounts of autotrophic bacteria in the water body.
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