Answer:
The scientific method is defined as a set of procedures for gathering and interpreting data
Answer:
Honestly, I would join them
Messengers delivered letters because they had No Postal system
Natural environment has the ability to gather some pollutants yet if too much then the environment could no longer handle it. A leaky sewage can pollute an aquifer with I. arsenic as the contaminant. Arsenic is a metalloid existing in the Earth's crush. Exposure is natural yet can be aggravated by the human activities.
