A. umbilical cord is the answer
Answer:
Larger islands that are large and close to the mainland are shos lower rate of extinction due to the fact that the species present have more space so there will be more resources available in comparison to smaller islands where limited space and limited resources available.
Extinction is greater on islands isolated due to the unlikelihood of immigration and as it is opposite to the island close to the mainland and competition is more in isolated islands.
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PCR is a useful technique because it is used to amplify small segments of DNA.
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D an animal or plant getting a new "ability" is an example of evolution like this plant can climb now