Scientists disagree about how many species are currently on earth for all of the following reasons EXCEPT:
a) there is controversy over whether natural selection is the only mode of speciation.
b) there is not one true definition of species.
c) at any one time, there are few populations in the process of speciation.
d) there are many organisms on Earth that have yet to be discovered.
e) different scientists use different techniques to estimate the actual number of species from the known number of species.
Ans: a) there is controversy over whether natural selection is the only mode of speciation.
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