Final answer:
Race improvement by selective reproduction is an example of eugenics, which was a pseudoscientific practice aimed at creating genetically superior humans.
Step-by-step explanation:
Race improvement, promoting reproduction for some and prohibiting reproduction for others, is an example of eugenics. Eugenics is a pseudoscientific field of study based on the idea that human evolution can be advanced by encouraging the reproduction of people who are considered genetically superior and discouraging or preventing the reproduction of those deemed as inferior. This practice gained notoriety in the early 20th century and was infamously implemented by Nazi Germany to create a 'superior' Aryan race by forcibly sterilizing and killing those labeled as 'unfit.'