*Question*
Answer the following question given this paragraph: Radio waves are used for communicating with spacecraft. A round-trip communication from Earth to Mars takes anywhere from 6 to 42 minutes. What challenges might this present for sending unmanned spacecraft and probes to Mars?. Q: How is communication initiated and maintained with spacecraft? Choices: - sonar - telegraph - wi-fi - radio waves A:
**Answer**
radio waves

*Question*
Answer the following question given this paragraph: Each hemisphere of the cerebrum is divided into four parts, called lobes. The four lobes are the:. Q: How many lobes is each hemisphere of the cerebrum divided into? Choices: - 9 - 2 - 5 - 4 A:
**Answer**
4

*Question*
Answer the following question given this paragraph: An organ is a structure composed of two or more types of tissues that work together to do a specific task. Most modern plants have several organs that help them survive and reproduce in a variety of habitats. Major organs of most plants include roots, stems, and leaves. These and other plant organs generally contain all three major tissue types. Q: What do you call a structure composed of two or more types of tissues that work together to do a specific task? Choices: - cell - marrow - system - organ A:
**Answer**
organ

*Question*
Answer the following question given this paragraph: Flickr:Image Editor. Planets in the solar system make elliptical orbits around the Sun . CC BY 2.0. Q: What kind of movement do planets in the solar system make around the sun? Choices: - optical orbits - round orbits - spinning orbits - elliptical orbits A:
**Answer**
elliptical orbits