Ag Au Sl Su Who was the President of the United States during the signing of the Civil Rights Act of 1964? Lyndon B. Johnson John F. Kennedy Richard Nixon Dwight D. Eisenhower Welcome to Level 2! CONTINUE What is the DNA sequence of genes called?
Sl Si Ag Au Which ancient civilization is credited with the invention of the water clock, or clepsydra? The oldest documentation of the water clock is the tomb inscription of the 16th century BC Egyptian court official Amenemhet, which identifies him as its inventor.