The answer is context clues. This is because you're using the clues from the other words (sentences/paragraphs) to answer the definition of the word.
Answer:
Volunteer work is important for your health. The Corporation for National and Community Service says that volunteering improves psychological and physical health. Volunteers reap the benefits of feeling a personal sense of accomplishment while building social networks that, in turn, support them in times of stress.
Answer: Planes haven given us as people the ablility to, View the Earth from above.
In a way yes it has changed our technology because nowdays people, Have a faster way to travel, for instance, a car can travel 435mph while that is nothing compared to a plane which can travel 1000kmh.
Explanation: Not sure if this was helpful but I did some quick research, and hope it helps you out mate.
C or a i don’t remember which it was on my test