First of all find out the structural composition of corona virus and its related family members. Also explore the different strains and find out which strain is chronic and lethal?

a, i am pretty sure.

d. groundwater flows through the subsoil and deposits minerals.

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