Scientists can't be sure about the early atmosphere and can only draw evidence from other sources. For example, volcanoes release high quantities of carbon dioxide. Iron-based compounds are present in very old rocks that could only have formed if there was little or no oxygen at the time.
Things like making posters or doing performances to persuade them into doing it
FARMING, FISHING,FORESTRY and mining are all examples of primary activities.
IT MIGHT BE B
Answer:
Explanation:
Lack of water, and food, being in the vast desert means hard food and little rain this leads to many organisms struggling to live, also being forced to drink dirtier water means you could catch a disease more easily
