Question

multiple choice question
after ____ scientists have determined that cichlids entered lake victoria about ____ years ago and subsequently underwent adaptive radiation, encouraged by dramatic changes in water level over the course of their evolution.
comparing the jaw bones of thousands of individuals; 200,000
sequencing the genomes of many individuals; 200,000
comparing the structure of vertebrae in hundreds of individuals; 2,000,000

Explanation:

Genome - sequencing is a powerful technique to study evolutionary history. By sequencing the genomes of many individuals, scientists can determine the time of divergence and evolutionary events. Comparing jaw - bones or vertebrae structures is more about morphological studies rather than precise dating of evolutionary events like the entry of cichlids into Lake Victoria. It is known that cichlids entered Lake Victoria about 200,000 years ago through genomic studies.

Answer:

sequencing the genomes of many individuals; 200,000