Well I would assume that since people of two races are called BIracial, then people of three races are called TRIracial.
The separation of people based on their race is called segregation.
This arrangement is called a codon.In DNA and RNA a group of three nucleotides in a row is called a codon. In tRNA a group of three nucleotides is called an anticodon.
A person who carries bricks is called a "bricklayer" or a "mason."
A person who studies a lot is often called a "bookworm" or a "knowledge enthusiast."
A person who studies physics is called a physicist, a person who studies chemistry is called a chemist, and a person who studies biology is called a biologist.
A racer or a jockey.
The person is called a Marshal.
multiracial or of multiple races
A member of the pit crew.
I believe the person who rides the horses in the races is called a Jockey.
the most common races were the three legged races and the wheel races
Fistful of Aliens
longboard races
A person who rides horses (mainly thoroughbreds) is called a Jockey
Yes. Some alien races have three fingers on each hand.
The gun used in running races is called a starter's pistol.
Oaks are races for fillies or mares