Answer:
Water volume remains the same.
Explanation:
Ice formation is a phase change from liquid to solid. The ice is less dense so its volume gets larger. Warm it up, melt the ice and it will return to the same volume it had as a liquid.
Foreign invaders have proteins called antigen, which antibodies lock onto to neutralize. The foreign proteins are different from proteins in our own body, so the immune system can recognize them and finally eliminate them.
