user: Answer the following question given this paragraph:   Plants may have colonized the land as early as 700 million years ago. The oldest fossils of land plants date back about 470 million years. The first land plants probably resembled modern plants called liverworts , like the one shown in Figure below .   Q: The oldest fossil of land plants date back how many millions of years?   Choices:  - 520 million years  - 350 million years  - 430 million years  - 470 million years  A:
470 million years


Answer the following question given this paragraph:   Stars are classified by color and temperature. The most common system uses the letters O (blue), B (blue-white), A (white), F (yellow-white), G (yellow), K (orange), and M (red), from hottest to coolest.   Q: What celestial bodies are classified by color and temperature, ranging from blue to red and hottest to coolest?   Choices:  - astroids  - planets  - galaxies  - stars  A:
stars


Q: Answer the following question given this paragraph:   The sensory division of the peripheral nervous system carries messages from sense organs and internal organs to the central nervous system. For example, it carries messages about images from the eyes to the brain. Once the messages reach the brain, the brain interprets the information.   Q: What system carries messages from sense organs and internal organs to the central nervous system?   Choices:  - sensitive nervous system  - respiratory system  - auxiliary nervous system  - peripheral nervous system  A:
A: peripheral nervous system


Question: Answer the following question given this paragraph:   Saturn’s largest moon, Titan, is about one and a half times the size of Earth’s moon. Titan is even larger than the planet Mercury. The picture below compares the size of Titan to Earth ( Figure below ). Scientists are very interested in Titan. The moon has an atmosphere that is thought to be like Earth’s first atmosphere with nitrogen and methane. This atmosphere was around before life developed on Earth. Like Jupiter's moon, Europa, Titan may have a layer of liquid water under a layer of ice. Scientists now think that there are lakes on Titan's surface. Don't take a dip, though. These lakes contain liquid methane and ethane instead of water! Methane and ethane are compounds found in natural gas.   Q: Europa and titan are names of what kind of celestial objects?   Choices:  - galaxies  - stars  - asteroids  - moons  A:
Answer: moons


*Question*
Answer the following question given this paragraph:   A: Energy is released when an atom gains an electron. Halogens release the most energy when they form ions. As a result, they are very reactive elements.   Q: What happens to energy when an atom gains an electron?   Choices:  - it is folded  - it is used  - it increases  - it is released  A:
**Answer**
it is released


(Question)
Answer the following question given this paragraph:   CHAPTER SUMMARY 22.1 Prokaryotic Diversity Prokaryotes existed for billions of years before plants and animals appeared. Hot springs and hydrothermal vents may have been the environments in which life began. Microbial mats are thought to represent the earliest forms of life on Earth, and there is fossil evidence of their presence about 3.5 billion years ago. A microbial mat is a multi-layered sheet of prokaryotes that grows at interfaces between different types of material, mostly on moist surfaces. During the first 2 billion years, the atmosphere was anoxic and only anaerobic organisms were able to live. Cyanobacteria evolved from early.   Q: What type of organism was the only able to live in the anoxic atmosphere of the first 2 billion years?   Choices:  - aerobic  - protists  - mammals  - anaerobic  A:
(Answer)


assistant: anaerobic