Which of the following structures is found in both plant and animal cells?

A. cell membrane
B. chloroplast
C. cell wall
D. large, water-filled vacuole

reflection is the bouncing back of a propagating wave when it encounters a barrier; usually shows an image of the source of light wave

1) bounces back from an opaque material

2) bounces back from the boundary

3) seen in mirrors

refraction is the bending of a propagating wave having a shift of direction as it passes through different media; usually seen in lenses to magnify or lessen

1) passes through a prism

2) moves from one medium to another

3) seen in lenses

what is the question? is it 'what is one of the reasons that someone could be b12 deficent?