Question

which two ideas are supported by the information in paragraphs 7–9?
□ plastic will be a popular material on mars.
□ people living on mars will have to recycle.
□ homes on mars will be made of wood and glass.
□ electricity on mars will be generated mainly from gas.
□ martians will eat mainly the food they can grow.

Explanation:

To solve this, we analyze each option (assuming typical Mars - related context from paragraphs 7 - 9, though not provided here, we use general Mars - living knowledge):

Option 1: "Plastic will be a popular material on Mars."

On Mars, transporting materials from Earth is difficult and expensive. Plastic is lightweight, durable, and can be made from local resources (like using Martian gases to synthesize polymers) or recycled. So it's plausible that plastic would be popular.

Option 2: "People living on Mars will have to recycle."

Resources on Mars are scarce. There is no large - scale supply of new materials from Earth, so recycling (of water, air, and materials) will be essential for survival and sustainability.

Option 3: "Homes on Mars will be made of wood and glass."

Wood is not a native resource on Mars, and transporting wood from Earth is impractical. Also, glass would be hard to make in large quantities without abundant resources, and Martian homes are more likely to be made of local materials like regolith - based composites. So this is unlikely.

Option 4: "Electricity on Mars will be generated mainly from gas."

Mars has a thin atmosphere with little gas suitable for large - scale combustion - based electricity generation. Solar power or nuclear power are more likely sources. So this is unlikely.

Option 5: "Martians will eat mainly the food they can grow."

Transporting food from Earth to Mars is costly and limited in supply. Growing food locally (in greenhouses) is the most sustainable way to get food, so Martians will likely rely on home - grown food.

So the two ideas supported are:

• Plastic will be a popular material on Mars.
• People living on Mars will have to recycle.
• Martians will eat mainly the food they can grow. (Note: Depending on the actual content of paragraphs 7 - 9, but from general knowledge, these three are plausible. But since the question asks for two, we assume the most likely two from typical Mars - living discussions are "People living on Mars will have to recycle" and "Martians will eat mainly the food they can grow" or "Plastic will be a popular material on Mars" and "People living on Mars will have to recycle".)

Answer:

• People living on Mars will have to recycle.
• Martians will eat mainly the food they can grow. (or other combination based on actual paragraph content, but these are the most plausible from general Mars - living context)