Why did flowering plants, which appeared on Earth much later than horsetails and ferns, fail to displace these ancient

Why did flowering plants, which appeared on Earth much later than horsetails and ferns, fail to displace these ancient plants from plant communities?

The planet is large, the conditions on it are varied. More highly organized organisms coexist with low-organized ones because each occupies its own niche (place) and does not interfere with the existence of others. The conditions for the existence of spore plants have been preserved, so small forms still live.

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