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The examinations and imaging were conducted on two occasions for a subsample, with an average interval of six years between the first and second imaging session.

The Berkeley institute’s poll surveyed 6,030 registered California voters online in English and Spanish, Aug. 24-29, including a weighted subsample of 3,113 considered likely to vote in the March primary.

Next, the team looked at a subsample of 99 cultures that, according to a widely used benchmark in anthropology, developed relatively independently of one another.

The poll was administered online in English and Spanish from May 17 to Monday among 7,465 California registered voters, of whom a weighted subsample of 5,236 were considered likely to vote in the March primary election.

The overall sample along with the subsample of 881 registered voters have a margin of sampling error of plus or minus four percentage points.