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The major weakness of Darwin's theory during his lifetime was





a. the fact that at certain points in embryonic development, diverse species all have structures known as pharyngeal gill slits.





b. the lack of a mechanism to explain how traits were passed to offspring intact when most believed inheritance worked through blending.





c. the fact that populations do not promote competition, but rather sharing.





d. that the fossil records indicated that all species that ever existed were alive at the time.





e. a lack of variation in natural populations.

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b. the lack of a mechanism to explain how traits were passed to offspring intact when most believed inheritance worked through blending.





Mendelian genetics solved this.