Q: What term describes how closely packed the particles of matter are? Choices: - range - mass - space - density A:
density

Q: What is the only metalloid in group 13? Choices: - phosphorus - gallium - alluminum - boron A:
boron

Q: Q: What colorful phenomenon occurs in the northern sky when particles from the sun energize ions in the thermosphere? Choices: - meteor shower - Coriolis effect - aurora nervosa - northern lights A:
A: northern lights

Question: Q: What is defined as male gametes that form in the testes and mature in the epididymis? Choices: - plasma - mucus - stereocilia - sperm A:
Answer: sperm

*Question*
Q: Acids can also react with metals, and when they do they produce what? Choices: - alloys - potassium gas - rust - hydrogen gas A:
**Answer**
hydrogen gas

Q: What feature of the spine helps with flexibility and strength? Choices: - shape - angle - arrangement - curves A:
curves