Refer to the graph. So far, the IUCN has assessed more than 76,000 species, but there are at least 8.7 million species on Earth (probably more), and most of them are invertebrates.Few plants and invertebrates have been assessed.Their list of at-risk organisms is heavily skewed toward vertebrates, which are larger and easier to measure.Given this knowledge, what is the most reasonable conclusion that can be drawn regarding the at-risk groups shown on the graph?
A) Of the species assessed, amphibians have by far the most species at risk.
B) Of the species assessed, most are likely to go extinct eventually.
C) Most dragonfly and other insect species are not at risk.
D) Vertebrates are most at risk because they are the most important organisms.
E) Even after new species are assessed, few plant species will be at risk.

Question

Refer to the graph.  So far, the IUCN has assessed more than 76,000 species, but there are at least 8.7 million species on Earth (probably more), and most of them are invertebrates.Few plants and invertebrates have been assessed.Their list of at-risk organisms is heavily skewed toward vertebrates, which are larger and easier to measure.Given this knowledge, what is the most reasonable conclusion that can be drawn regarding the at-risk groups shown on the graph?
A) Of the species assessed, amphibians have by far the most species at risk. 
B) Of the species assessed, most are likely to go extinct eventually. 
C) Most dragonfly and other insect species are not at risk. 
D) Vertebrates are most at risk because they are the most important organisms. 
E) Even after new species are assessed, few plant species will be at risk.

Quizplus · Accepted Answer

The graph shows that among the assessed groups, amphibians have the highest proportion of species categorized as threatened or extinct. However, it is important to note that this is only among the species that have been assessed and there are likely many more at-risk species, particularly among invertebrates, that have not yet been evaluated by the IUCN.

Refer to the Graph