Final answer:
The synonym of "apex" is either acme, pinnacle, or summit, all of which denote the highest point; "bottom" is not a synonym as it indicates the lowest position. Options 1, 2 and 3 are correct.
Step-by-step explanation:
The synonym for "apex" is 1) acme, 2) pinnacle (ignoring the typo), and 3) summit. These words all describe the highest point or top of something. The option 4) "bottom" is not a synonym as it refers to the lowest point.
When we look at biological or ecological terms like apex consumers, the use of the word "apex" similarly denotes the top position in a food chain, where these consumers have no natural predators. Likewise, apical meristem refers to the region at the tips of plants where growth occurs at the peak or apex of the plant structure.