Of or related to hydrometry
C. The gold rush was happening around this time
They were called petroglyphs.
Well, the Aztec economy was heavily reliant on agriculture and trade. The land controlled by the Aztecs was fertile, allowing farmers to grow corn, squash, beans, avocados, hemp, tobacco and peppers. The Aztecs then used this surplus of food to establish marketplaces to trade for a variety of goods and services, including jewelry, raw materials, medicine and wood. Precious metals, such as gold, were also prevalent in the Aztec Empire.
I have a picture for the Aztec for you
Answer:
Research on epigenetics.
Explanation:
Epigenetics is the study of heritable changes in the gene expression that don't involve changes to the underlying DNA sequence of the subject. This means that environmental influences can determine how a gene is expressed; it could affect them as well. Therefore, more research on this subject is necessary.