本题目来源于试卷: Threats to Biodiversity，类别为 IB环境系统与社会
[单选题]
The Galapagos Islandstaw g br p/6v 5ei,h4ns1 lhv/sncz336, about 1000 km off the coast of Ecuador:gv2 j.e r/r-y/)iosh39d ojyci)8.wqg mua e, were made famous by Charles Darwin's work on speciation. Species from small gdu ew i/8)arjv )o:/ir9gqo23smecjh.-y y. islands like these are at a higher risk of species extinction.
Identify which of the following are characteristics of species on small islands such as the Galapagos Islands.
A. Species on small islands have large populations.
B. Species on small islands are more vulnerable to invasive species due to less natural defense adaptations.
C. There is more genetic diversity on small islands.
D. Isolated populations are less susceptible to disease.
参考答案: B
本题详细解析:
Option A is false as small islands have a limited carrying ca9zz;y- 0lqg- .grl(lgsnm j/s pacity, thus have small populations of species normally.
Option B is true due to the isolation of the populations and lack of genetic variability.
Option C is false as, due to isolation limiting the gene pool, populations are less diverse genetically.
Option D is false as lower gyl gsgrqj- .l9-l s(0;z /zgmnenetic diversity makes populations more susceptible to disease.
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