Which sentence could be added to the passage to support the main idea? a. other planets, seen through telescopes, show signs of volcanic activity, much like our Earth.
b. recently, water has been discovered on Mars, making it seem more possible that life could exist there.
c. also, the Earth's tilt and its distance from the sun means we have mild seasons that humans can withstand.
d. probes we have sent into space have brought back data on other planets that are too far to ever visit.

Also, the Earth's tilt and its distance from the sun means we have mild seasons that humans can withstand.

Explanation:

The main idea of the passage is that Earth is the only planet that can support life. The correct answer gives two more reasons why this is so: our distance from the sun and the tilt of the earth, which allows us to have mild seasons. If this were not the case, temperatures would be too extreme to support life.

d) she is both terrified and excited by the idea of returning to school.

a) she takes one day at a time.

d) she felt like she was an object of ridicule.

d) she tells her daughter not to worry about it because things will get better.\

b) elnora needs money for books and out-of-town tuition. she will raise the money herself.