ACTIVITY No. 8 Direction: Identify what is described in each box and write the answer. Then use the numbered boxes to answer the riddle that follows.

As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.

What did the leaders of the soviet union feel would provide the most protection for their country

Which of the following was not a result of early humans increasing proficiency at finding food