The biological species concept (BSC) defines species based on reproductive isolation; distinct species fail to mate or fail to produce fertile and viable hybrids

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The biological species concept (BSC) defines species based on reproductive isolation; distinct species fail to mate or fail to produce fertile and viable hybrids. If the BSC is the "gold standard" for understanding what species are, why are most species still recognized based on phenotypic differences (the morphological species - or morphospecies - concept)?  

Select all choices that apply.

Group of answer choices

a. The Endangered Species act requires species to be defined on the basis of morphology.

b. Reproductive isolation cannot be tested in fossil forms.

c. The mating experiments necessary to confirm reproductive isolation of presumed species pairs are very time-consuming.

d. Reproductive isolation is not a meaningful concept in microbes that only reproduce asexually.