Answer: B. combined with another molecule
Explanation:
i just took the test
To be honest, since we live on Earth (assuming you do as well), Earth is the easiest planet to study. We don't know much about the other planets because we've never been to any of them. I believe that the second easiest planet to study is either Uranus or Saturn.
Fish nets can be very detrimental towards the ecosystem, as they can trap unintended wildlife, which can horribly tilt the ecosystem one way or another.
Answer:
I don't know,sorry.I hope that I could help but I cant