Question

review the text. staying grounded 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 unlimited 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 great that getting to mars and attempting to settle it are not worth the select the three supporting claims that the author makes to argue that we should not send humans to mars because the costs and risks are too great. exposure to mars material could damage earths environment. marss environment may become cross - contaminated. the astronauts could suffer physically and mentally. no rocket ship exists that would work for the mission.

Explanation:

The text focuses on the risks of sending humans to Mars. Physical and mental suffering of astronauts directly relates to risks. Cross - contamination of Mars' environment and damage to Earth's environment from Mars material are also risks. The rocket - ship statement is not in the text.

Answer:

• Exposure to Mars material could damage Earth’s environment.
• Mars’s environment may become cross - contaminated.
• The astronauts could suffer physically and mentally.