The growth rate of a population is the amount by which a population's size changes in a given time. In which of the following ways
are immigration and birth rate similar in regards to a population's growth rate?
A.
Both immigration and births add individuals to a population
B.
Neither immigration nor births occur when a population has reached its carrying capacity
C.
Neither immigration nor births occur if a population has limiting factors
D.
Both immigration and births subtract individuals from a population
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he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

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.