I'm sorry, but the only one I know is the first blank: 30
I hope this helps!
The Columbian Exchange connected the Eastern and Western Hemispheres by using same things like food, livestock, and crops.
Answer:
Water pollution is defined as the presence in groundwater of toxic chemicals and biological agents that exceed what is naturally found in the water and may pose a threat to human health and/or the environment.
Air Pollution is defined as the presence of substances in the atmosphere that have a harmful effect on human health as well as the health of other living organisms
