Final answer:
The exact number of mammal species exploited by Homo erectus at Zhoukoudian is not provided in the answer choices, but the site is significant for its archaeological evidence of Homo erectus activity, including tool use and fire.
Step-by-step explanation:
The question "How many mammal species did Homo erectus exploit at Choukoutien?" is related to the archaeological findings at Zhoukoudian, a site in China where evidence of Homo erectus activity was discovered. Unfortunately, the answer choices provided do not match any known data from this site, which is well-documented in anthropological research. The site at Zhoukoudian is famous for yielding several remains of Homo erectus, known as 'Peking Man', and evidence of tool use and fire. It is known that Homo erectus exploited several mammal species, but the exact number is not specified in the options given.