*Question*
Q: What planet is the easiest to observe? Choices: - mercury - pluto - uranus - mars A:
**Answer**
mars

*Question*
Q: What are the three main types of rocks? Choices: - limestone , igneous and metamorphic - plutonic, igneous and metmorphic - crystalline , igneous and metamorphic - sedimentary, igneous and metamorphic A:
**Answer**
sedimentary, igneous and metamorphic

*Question*
Q: The central nervous system is composed of the brain and what else? Choices: - the sclerotic cord - the dynamic cord - the lateral cord - the spinal cord A:
**Answer**
the spinal cord

*Question*
Q: What group of animals are the largest arthropods? Choices: - birds - fish - spiders - insects A:
**Answer**
insects