Question: Q: Approximately how many billion years ago did our solar system begin? Choices: - four billion - three billion - nine billion - five billion A:
Answer: five billion

Question: Q: Cancer involves what changes that modify cell-cycle control and alter the growth rate or progression of the cell through the cell cycle? Choices: - deletions - enhancements - stabilization - mutations A:
Answer: mutations

Question: Q: In what type of body of water is most of the earth's water located? Choices: - streams - rivers - seas - oceans A:
Answer:
oceans