If ferns produce so many spores, why the world isn't being taken over by ferns

Birds catipillars and many other animals would consume the spore, also some may die by freezing or drought.

Animals rat the spores. Not only that, but humans build and farm where most ferns used to be.

2positives of biotechnology: 1. plants have become more resistant to viruses and other communicable pests.2. with the of biotechnology, we have been able to produce better tasting fruits as well as vegetables.2 negatives of biotechnology: 1. biotechnology poses a number of environmental threats. genetically modifies crops often infect monarch butterflies and other insect species.2. viruses could combine with crops.

It is 4.92 e-4 sorry if i am wrong