It sends an impulse back to the cell body of a neuron
What holds the two strands of DNA molecules to each other. Hydrogen Bonds
prevents backflow into the left atrium
A) the ozone layer, it is the one that takes the uv light from the sun
To protect our eyes from moisture and light. Example: from sweat. It can also reduce the amount of light that gets in your eyes and keep dirt away from them too.