Which mass is easily forgotten about when trying to prove the law of conservation of mass in a chemical reaction.

1water
2salt
3gas
4rock

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

Acovalent bond is formed between the two hydrogen bonds

Yummy, tasty, delicious