Multiple choice question - choose single answer

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Jul-2021

Read the text and answer the multiple-choice question by selecting the correct response. Only one response is correct.

Different Species

There are innumerable different species on the planet. Nobody really knows how many species there are, though many scientists have tried to estimate it. However, the complexity of trying to do this makes it impossible to establish a definitive number with any confidence. This is probably due to the fact that new species are continually appearing, while at the same time existing species evolve and some become extinct. In the past, the number of new species appearing exceeded the number of those dying out. Nowadays, however, due to human activity, this trend has reversed and as a result we are in danger of seriously disturbing our ecosystem.

Why is it difficult to establish the number of species globally?

a) discussing different approaches biologists have taken to testing theories about the distribution of plants in Hawaiib) discussing different theories about the transport of plant seeds to Hawaiic) discussing the extent to which air currents are responsible for the dispersal of plant seeds to Hawaiid) resolving a dispute about the adaptability of plant seeds to bird transport

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