Answer: Cyanobacteria
Explanation:
The oldest known fossils, in fact, are cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old. This may be somewhat surprising, since the oldest rocks are only a little older: 3.8 billion years old!
The ground zone containing grasses is not a characteristic of the zones of a deciduous forest. The correct option among all the options that are given in the question is option "d". There is definitely a ground zone in the deciduous forest, but it consists of mostly true mosses, club mosses and lichens. The soil of these forests are very fertile in nature.
That country would be Argentina
Food Supply: the production of food and its movement from one place to the other
Pandemic: a disease prevalent over an entire country or world
Abattoirs: slaughterhouses