Which development in human history first made waste disposal a problem? a. decrease in birth rate b. growth of cities c. increase in agriculture d. new diseases

What provides structure to the human body?

Which compound contain an iron with a 3+ charge

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate