Answer:
The correct answer is - people accept it in exchange for goods and services.
Explanation:
Money is valuable because we know that it is "accepted." Money can be used to purchase goods and services even though it is no longer backed by gold. Security measures prevent counterfeiting but do not add value.
Answer:
The earth would eventually become become a brown and grey wasteland and the blue sky and rainbows and things like that will be rare rain would be highly acidic
B. larger and more complex
Explanation: As the environment became more unpredictable, bigger brains helped our ancestors survive.
The answer is D. Because it takes light 8 mins to reach the Earth from the sun.