Please help asap!! Imagine a population of birds in which first-year birds can either (1) find a mate and raise an average of three offspring or (2) stay in their parents' territory and help the parents raise two more offspring than the parents would have been able to raise without any help. Which of following statements best describes this situation? A) Most first-year birds would choose to forego breeding, increasing fitness.
B) The behavior of helping at the nest would not increase fitness in this population.
C) Altruistic behavior would be common in this population, increasing fitness.
D) Most territories would have young birds helping at the nest to increase fitness.

lipid

explanation:

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.