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Animal quiz: Test yourself on these fun animal trivia questions

We don't know exactly when the first animals on Earth appeared, but it's thought to be around 700 million years ago. Around ...
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100 Tricky Science Trivia Questions—With Answers

1. Question: What is the largest planet in our solar system? Answer: Jupiter 2. Question: What is the fastest animal on land? Answer: The cheetah 3. Question: What are the three layers of the Earth?