Some 35,000 Years Ago, Our Ancestors Learned That Heating Clay

Multiple Choice

Some 35,000 years ago, our ancestors learned that heating clay to high temperatures allowed it to harden substantially. Many years later, using this earlier knowledge, our ancestors invented pottery. Pottery is classified as a:​

A) ​primary invention
B) ​secondary innovation
C) ​primary application
D) ​tertiary modification