Explain the line "biologists make a .....On earth "

Dear student,
Please find below the answer:

It can be explained as:

The biologists collect the data of a number of species of a particular group like the group of insects that have been studied thoroughly in both tropical and temperate regions of the earth. They then compare the number of these species in tropical and temperate regions and analyze, interpret and organize the collected data.  They utilize this data to assume that existing trends of the ratio of thoroughly studied insects will be similar for other groups like plants and animals in these habitats. After compiling the data of all species, they provide a total estimate of species found on earth.

Hope this clears your doubt.
Regards.
 

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