Which of the following stages would come first in the life of a star? neutron star white dwarf protostar black hole

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

Can someone me with 3 and 4 plz. this is for masteries test.

Which statement best describes what happens when molecular compounds melt