In addition to her work on the Miocene hominid fossil record, Mary Leakey contributed to archaeology through her discovery of the earliest direct evidence of hominid activity and through her painstaking documentation of East African cave paintings.
(A) Mary Leakey contributed to archaeology through her discovery of the earliest direct evidence of hominid activity and through her painstaking documentation of
(B) Mary Leakey contributed to archaeology by her discovery of the earliest direct evidence
...
(A) Mary Leakey contributed to archaeology through her discovery of the earliest direct evidence of hominid activity and through her painstaking documentation of
(B) Mary Leakey contributed to archaeology by her discovery of the earliest direct evidence
...




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