The planets are composed of helium and hydrogen, making them less dense then the planets.

Idon't know. the question you are trying to ask doesn't make sense.

Iwould say the answer is: trade windshope that : )

This is a true statement  hope this : )

Answer is b)eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent decrease in the oxygen levels of the watereutrophication occurs when there are excess nutrients in a body of water. this results in plants having more food and reproducing  more, sometimes leading to more aquatic animal life as well. ultimately, this can reduce the oxygen level in the ecosystem.