Q: What is the nervous tissue in the brain and in the rest of the nervous system made up of? Choices: - electrons - plastic - ions - neurons A:
neurons

Q: Kidney stones are considered a disease that affects which system? Choices: - muscular system - reproductive system - digestive system - urinary system A:
urinary system

Q: Q: What do craters and rifts become when the fill with water? Choices: - rivers - creeks - grasses - lakes A:
A: lakes

Question: Q: What makes echinoderms force water into the feet and move forward? Choices: - spring contractions - vacuum contractions - field contractions - muscle contractions A:
Answer: muscle contractions

*Question*
Q: Smoking increases the risk of cancer from what radioactive gas that can also be detected with a test kit for your home? Choices: - arsenic - carbon monoxide - carbon dioxide - radon A:
**Answer**
radon

(Question)
Q: The only obvious difference between boys and girls at birth is what type of organs? Choices: - digestive - respiratory - nervous - reproductive A:
(Answer)
reproductive