Why are humans not an invasive species

Originally Answered: Are humans considered an invasive species? No, because the term is generally applied only to species that were introduced to an ecosystem and cause harm. Humans were not introduced to any ecosystem. Instead, humans underwent what is called a 'natural range expansion.

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there is no

explanation:

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.