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Human influences on the environment

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Question 4

In an ecological assessment of a coastal estuary impacted by maritime trade, marine biologists documented a total of 4,375 non-native species. Among these recorded non-native species, 1,514 were classified as invasive species that actively disrupt local trophic webs, while the remainder were non-invasive.

a.

Suggest what is meant by the term non-native species.

[2]
b.

Calculate the percentage of these recorded non-native species that are classified as invasive. Give your answer to one decimal place. Show your working.

[2]

Human influences on the environment Questions

  1. IGCSE
  2. /Biology
  3. /Human influences on the environment