2. There are approximately 7.7 billion humans on Earth. If the virus spreads beyond the

200-person town, how long will it be until everyone on the planet is infected?

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.

ever get the answers? im stuck on this as well