There are three answers: A heck of a lot, not that many, and a whole heck of a lot. Or, if you want specifics: 5, 2, and at least 99.

ANTHROPOLOGY
Always a bridesmaid and never a bride, B is the also-ran, the second best, the afterthought, the sidekick to the alphaletter A. When things fall apart, we go to Plan B; we’ll watch B-movies with B-list actors on basic cable if we can’t fall asleep; we’ll
Women are doing amazing work in primatology, the study of monkeys, apes, prosimians, and even humans. Although many are working on furthering our understanding of our closest relatives, we will take a look at only the most prominent.