The printing press did this
Canada's climate is A (artic), B (continental), and C (subarctic).
Answer:
The correct answer is C)
Explanation: The lake with no Sphagnum mat has less disolved oxygen. The moss is a plant which generates and liberates oxygen as part of its metabolism. The oxygen disolves into the whater of the lake which has this Sphagnum mat, giving it a higher concentration of disolved oxygen than the other one.
Three billion years ago, according to National Geographic
