Marcus wants to teach his dog to sit, and he wants his dog to learn the behavior in the fastest manner possible. Based on what you know about schedules of reinforcement, you tell him it would be BEST to use a(n) schedule of reinforcement. negative
continuous
intermittent
partial

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the correct answer is:

a population changes in response to a change in the environment.

b is dominant over the allele for the white fur.

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.