To fit and work in specific kinds of plants, as complex as then. It's like a key in a keyhole, if it's not the correct, its not able to fertilizer the plant. Nature 's Wisdom...
Why do some pollen grains have complex shapes?
to hold on too birds insects and too catch wind and pollenate more grain
Reply:I read some time ago that the shapes of pollen are related to their ability to irritate the mucousal passages and produce a histamine response from mast cells, producing an allergic response. It could be that pollen has evolved in this way for some benefit.
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