Final answer:
2) Apices. is the plural form of apex
Step-by-step explanation:
The plural form of "apex" is "apices" (Option 2). In anatomical and scientific contexts, the term "apex" refers to the pointed or highest part of a structure, and its plural form follows the standard Latin pattern.
The use of "apexes" (Option 1) or "apexs" (Option 3) does not adhere to the grammatical rules for forming plurals from words of Latin origin. Additionally, "apexi" (Option 4) is not a valid plural form.
Understanding the correct plurals of scientific terms is crucial for effective communication in academic and professional settings, especially in fields such as anatomy, biology, and medicine. The plural "apices" accurately reflects the proper grammatical construction and usage in these contexts.