The first question i am not sure of

Hi, my brother asked me about this question you have. I am currently in AP Biology in 10th grade. I believe there might be more info I would need to help you figure out this question. Such as if there was a seed plased in flask A and B or A and not B. Was theplant originally put into flask a? If this is all the info there is, I mcan still figure it out. I see a letter "C" that is lettering what qustion there is and I am wondering if there is a question a or b that could futher help us.

Thanks

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.