input: OPTIONS:
- covalent bonds
- magnetic bonds
- k. bonds
- n bonds Now, answer this question: Q: Elements below the second period, such as silicon, do not form what as readily as second-period elements, and when they do form, they are weaker than those formed by second-period elements? A:
A:
output: n bonds

input: OPTIONS:
- Guitar
- angry sounds
- outside sounds
- loud sounds Now, answer this question: Q: Exposure to what is the most common cause of hearing loss? A:
A:
output: loud sounds

input: OPTIONS:
- sodium bicarbonate
- hydrogen carbonate
- carbon dioxide
- calcium carbonate Now, answer this question: Q: Many species secrete a hard external skeleton of what? A:
A:
output:
calcium carbonate