*Question*
Q: What planet is the easiest to observe? Read this paragraph and choose the correct option from the provided answers: Mars is the easiest planet to observe. As a result, it has been studied more than any other planet besides Earth. People can stand on Earth and observe the planet through a telescope. We have also sent many space probes to Mars. A car-sized robotic rover, Curiosity, arrived on the Red Planet in August 2012. Curiosity joins Opportunity, which has been active since 2004. Choices: - mercury - pluto - uranus - mars A:
**Answer**
mars

*Question*
Q: What are the three main types of rocks? Read this paragraph and choose the correct option from the provided answers: A geologic map shows the different rocks that are exposed at the surface of a region. Rock units are shown in a color identified in a key. On the geologic map of the Grand Canyon, for example, different rock types are shown in different colors. Some people call the Grand Canyon "layer cake geology" because most of the rock units are in layers. Rock units show up on both sides of a stream valley. 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? Read this paragraph and choose the correct option from the provided answers: User:Grm_wnr/Wikimedia Commons, modified by CK-12 Foundation. The central nervous system is composed of the brain and the spinal cord . Public Domain. 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? Read this paragraph and choose the correct option from the provided answers: There are several traits shared by all arthropods. Arthropods have a complete digestive system. They also have a circulatory system and a nervous system. In addition, they have special organs for breathing and excreting wastes. Other traits of arthropods include:. Choices: - birds - fish - spiders - insects A:
**Answer**
insects