Question

add commas, semicolons, or colons if needed. otherwise, submit the text without any additional punctuation.
unfortunately, most people are unaware of the contributions of female scientists such as ida noddack, a german chemist cecilia payne - gaposchkin, an american astronomer and muriel wheldale onslow, a british biochemist.

Explanation:

In a list of items (here, female scientists), commas are used to separate the different elements. Since "Ida Noddack, a German chemist", "Cecilia Payne - Gaposchkin, an American astronomer", and "Muriel Wheldale Onslow, a British biochemist" are three separate examples in the list, a comma is needed after "astronomer" to separate the second and third elements in the list.

Answer:

Unfortunately, most people are unaware of the contributions of female scientists such as Ida Noddack, a German chemist, Cecilia Payne - Gaposchkin, an American astronomer, and Muriel Wheldale Onslow, a British biochemist.