W
hat was the role of the lung model in this scenario?
Dr. Simonson was trying to explain to Justine why her
smoking might lead to further health problems. He took
out a model of a lung and showed her the air passages
and windpipe. He then explained how smoking affected
the lung and that she may be susceptible for lung cancer.
It was used to understand something that cannot easily
be seen.
It was used to prove that smoking causes health
problems.
It was used to demonstrate a pattern.
It was used to represent something big.

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.

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.