Which statements describe S waves? Select three options.
They move side to side.
They arrive after P waves.
They travel through solids.
They travel through liquids.
They occur at Earth’s surface.

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

All phases of matter may have a fixed mass

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems