C. yeast and some bacteria
1. Homo erectus
They were widespread, inhabiting almost every modern continent.
The correct option is: INCREASED EUTROPHICATION CAUSED BY HIGH LEVELS OF NITROGEN AND PHOSPHORUS.
Eutrophication refers to the excessive richness of a body of water as a result of run offs from the land. This caused the body of the water to be densely populated by plants thus causing structural changes to the ecosystem of the water.<span />