Which statement correctly identifies a difference between the function of most arteries and veins?
A. The circulatory system moves blood throughout the body
B. The respiratory system moves blood throughout the body
C. The circulatory system moves gases in and out of the body
D. The respiratory system moves gases in and out of the body

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2