Four-year-old karen can't remember anything of the first few months of her life. this is best explained by the fact that the trauma of birth interferes with the early formation of memories. most brain cells do not yet exist at the time of birth. experiences shortly after birth are a meaningless blur of darkness and light. the hippocampus and frontal lobes are immature during early infancy.

the answer to your question is:

c. complementary base-pairing

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.