Technician a says that the oil control ring scrapes oil off the cylinder wall with each downward piston stroke. technician b says that a typical oil control ring consists of two separate pieces. who is right? a. neither technician a nor b b. both technicians a and b c. technician b only d. technician a only
for penn foster..

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

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.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease