It’s someone’s opinion so the key word “best hints that it an opinion so to be objective is to be unbiased. If you're objective about something, you have no personal feelings about it.
The answer is:
A) Cells are the basic unit of life.
Answer:
Carbon dioxide is the waste released
Answer:
8. D
9. D
10. C
I'm not sure about number 8
In the food chain, animals such as mice eat grass and therefore, a fox needs the grass as much as the mice