In an experiment, a scientist decides to study the effect of exercise on cholesterol levels in people. he studies two set of people—those who exercise every day 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 . to test this statement, the scientist would measure cholesterol levels in exercisers and non-exercisers. the cholesterol levels would be .

The exercise reduces the levels of the low density lipoproteins or the bad cholesterol. It is found that, the people, who exercise daily have a low level of low density lipoproteins, and an increased level of high density lipoprotein, which is also known as good cholesterol.

Hence, to check whether a person exercises regularly or not, the scientist can determine the cholesterol level, in case, the bad cholesterol is high, then it indicates low physical activity.

In non exercisers the cholesterol level would be high.

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is a hypothesis . To test this statement, the scientist would measure cholesterol levels in exercisers and non-exercisers. The cholesterol levels would be a dependent variable.

Explanation:

Scientific hypotheses, in general, are the premises within a given theory, which can be validated on the basis of a scientific method, contributing to the formulation of new hypotheses. In this experiment the theory says that cholesterol levels between people who exercise and people who do not exercise is different. Within this theory, the statement says that people who exercise for an hour may have lower cholesterol levels, is a hypothesis that will be confirmed or refuted after the experiment.

The dependent variable is summarized in the phenomena or factors explained or identified, because they are influenced or determined by the independent variable. In this experiment the independent variable is the performance (or not) of exercises. Exercise is what influences or determines cholesterol levels in this study. Thus, cholesterol levels are a dependent variable.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

d) center of the mid-ocean ridge

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