When the following redox equation is balanced using the smallest whole-number coefficients, what is the coefficient of no2? sn + hno3 → sno2 + no2 + h2o (acidic solution).

Layer r contains a well-known index fossil that is 100 million years old. based on this information and the principle of superposition, a. layers t and m are older than 100 million years, and layers x and g are younger than 100 million years. b. layers t, m, x, and g are all older than 100 million years. c. layers t and m are younger than 100 million years, and layers x and g are older than 100 million years.