(Q).
Answer the following question given this paragraph: Volatile organic compounds (VOCs) are carbon compounds such as methane. VOCs are released in many human activities, such as raising livestock. Livestock wastes produce a lot of methane. Q: The waste of cows releases a lot of which type of gas? Choices: - carbon dioxide - oxygen - sulphur - methane A:
(A).
methane

(Q).
Answer the following question given this paragraph: Covalent bonds are bonds in which atoms share rather than transfer electrons. Compounds with covalent bonds are called covalent compounds. Q: What do you call compounds that have covalent bonds? Choices: - reflectivity compounds - valence compound - ions - covalent compounds A:
(A).
covalent compounds

(Q).
Answer the following question given this paragraph: Water on Mars can't be a liquid. This is because the pressure of the atmosphere is too low. The planet does have a lot of water; it is in the form of ice. The south pole of Mars has a very visible ice cap. Scientists also have evidence that there is also a lot of ice just under the Martian surface. The ice melts when volcanoes erupt. At this times liquid water flows across the surface. Q: What form does water take on the planet mars? Choices: - plasma - gas - liquid - ice A:
(A).
ice