1. Yes, humans always have an appendix unless it is removed of course.
    Chris Massey Chris Massey United States says:
    February 8, 2025 at 9:23 PM

    2.  studies revealed that an appendix is variably present in all other major primate clades, including catarhines (Old World Monkeys), platyrrhines (New World Monkeys), and strepsirrhines (lemurs and lorises; Clark, 1971; Hill, 1958; Hill & Rewell, 1948; Scott, 1980; Straus, 1936). Only in hominoids is the trait fixed and the appendix consistently vermiform (Clark, 1971; Hill, 1958; Hill & Rewell, 1948; Scott, 1980; Straus, 1936). In other primates, the shape may vary, ranging from a small appendix-like projection to a large, bulbous structure (Fisher, 2000; Scott, 1980).

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