Which type of muscle is found only in the heart?

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

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

What was bohr’s contribution to the planetary model