When an introduced species spreads naturally and impacts native species it is called an
species.

Question

When an introduced species spreads naturally and impacts native species it is called an 
 species.

BlackTom AI · Accepted Answer

The question asks to fill in the blank: 'When an introduced species spreads naturally and impacts native species it is called an 
 species.'
Option 1: 空白1. This option is not a real species epithet or term in biology. It acts as a placeholder or label rather than naming the type of species being described, so it cannot correctly complete the sentence.
To understand what belongs in the blank, consider the ecological concept involved: an introduced species that spreads and has negative effects on native species is typically labeled as invasive. The term 'invasive' conveys both the spread into new areas and the disruptive impact on indigenous populations, habitats, or ecosystems.
Think about the intended definition: an introduced species that becomes disruptive and establishes itself in a new environment is characterized as invasive, not merely introduced or nonnative. That distinction matters because other descriptors (like 'alien' or 'exotic') describe origin, but not the ecological impact or spread dynamics implied by the prompt.
In summary, the blank should reflect the standard ecological term for species that spread and disrupt native communities, which aligns with the concept of an invasive species. The provided option 空白1 does not capture this meaning, whereas the concept it is testing points toward naming the species as invasive.

When an introduced species spreads naturally and impacts native species it is called an species.

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