Answer:
A. Mammals the Cenozoic Era gave rise to the mammals to evolve.
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Answer:
Decay adds carbon to the atmosphere.
Answer:
D. service
Explanation:
Most people in the US work in jobs that require providing a service to others, whether it's at a restaurant, a department store, a school, etc. Yet, those who work in specialised jobs like agriculture, fishing, and mining are more rare because they need to live in a certain area that is optimal for such positions.
Thus, the answer is D.
