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<span>D. They believe his father will be killed and they feel sorry for him.</span>
A simile can be found when using "like" or "as" between two things. Example: I'm as happy as a clown.
Your question would be a metaphor. Both things are being compared to a science expieriment, probably meaning that they need to have an outcome, but it isn't known for sure if it will be a good or bad outcome.
Things like this can be taken many ways, so if you think something else, I'm sure it would work as well.
Answer:
See explanation below
Explanation:
"On planetary surfaces, astronauts will need surface mobility to explore multiple sites across the lunar and Martian surfaces" can be rewritten as:
In outer space or the atmosphere (usually where planets, the moon, the sun and other similar bodies come in contact with the atmosphere), scientists that are trained to travel in space will need to have fluid movement in order to explore the moon's surface and the surface of the planet Mars.