A command economy<span> and a </span>mixed economy<span> are two different </span>economic systems<span>. ... A </span>mixed economic system<span> has features of both a command and a </span>free<span> market</span>system<span>. A </span>mixed economy<span> is partly controlled by the government and partly based on the forces of supply and demand</span>
Answer: Scientists have recorded five significant ice ages throughout the Earth's history: the Huronian (2.4-2.1 billion years ago), Cryogenian (850-635 million years ago), Andean-Saharan (460-430 mya), Karoo (360-260 mya) and Quaternary (2.6 mya-present).
I hope this narrows it down a little bit
1. What strategies did humans use to obtain food before the end of the last ice age? Hunting and fishing
How did these strategies change during the Neolithic Revolution? After the Neolithic they learned how to plant
Back then, the answer would be A. But, if this was a MODERN question, the answer would be D.
