Question

staying grounded
1 during the nineteenth century, many americans believed in manifest destiny. this phrase refers to the idea that the united states was certain to expand its territory to the pacific ocean and beyond. while a popular and patriotic notion for many, others saw the idea of manifest destiny as an aggressive and arrogant mission that put people in harms way. today, the same concept of entitled expansion can be seen in the enthusiasm surrounding sending humans to mars. while the image of deep space travel and settlement on a whole new planet is certainly romantic, it is far from practical, or even humane. the dangers of this overly ambitious voyage are so grave that getting to mars and attempting to settle it are not worth the
select the two supporting claims that the author makes to argue that we should not send humans to mars because the costs and risks are too great.
no rocket ship exists that would work for the mission.
exposure to mars material could damage earths environment.
the astronauts could suffer physically and mentally.
marss environment may become cross - contaminated.

Explanation:

The author argues against sending humans to Mars due to high costs and risks. The claim about astronauts' physical and mental suffering directly addresses the risks to humans (cost in terms of human well - being). The idea that exposure to Mars material could damage Earth's environment also highlights a significant risk (cost in terms of environmental damage).

Answer:

• The astronauts could suffer physically and mentally.
• Exposure to Mars material could damage Earth's environment.