Gravity made the egg sink to the bottom of the beaker. The vinegar caused the eggshell to dissolve. The egg was denser than the vinegar. Bubbles appeared on the eggshell.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: When a chicken egg was placed in a beaker of vinegar, bubbles formed on the eggshell. After twenty-four hours, the eggshell is no longer present. Which statement is an observation?
Possibilities:
- Gravity made the egg sink to the bottom of the beaker.
- The vinegar caused the eggshell to dissolve.
- The egg was denser than the vinegar.
- Bubbles appeared on the eggshell.

Bubbles appeared on the eggshell.