Answer:
1. d. form of life
Bacteria are a form of life and if it is found that they are fossilized on meteors then it could mean that there is life in outer space because that would be where the bacteria came from.
2. c. have strong disagreements about it.
A controversial topic is one that not everybody believes and so have disagreements about with some believing it and others disagreeing with it.
3. b. he has invited many scientists to look closely at his work.
If the scientists that Dr. Hoover invites, reviews his work and finds it to be accurate then his research would be proven correct because scientists are experts giving their expert opinions would serve as enough proof of truth.
4. c. Dr. Hoover believes he has found fossils of bacteria.
The reading shows that Dr. Hoover believes that he has indeed found fossils of bacteria and that these fossils come from outer space.