In an experiment, a scientist decides to study the effect of exercise on cholesterol levels in people. He studies to set up people-those who exercise everyday for an hour and those who don't exercise at all. In this case, the statement that people who exercise for an hour may have lower cholesterol levels is: A. a hypothesis
B. a law
C. an observation

to test the statement, the scientist would measure cholesterol levels in exercisers and non-exercisers. The cholesterol levels would be:

A. a dependant variable
B. an independent variable
C. qualitative data

multiplying and dividing the two decimals and the eqations by the same number of the overalls

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.

is it multiple choice?