In an experiment, the independent variable
a.
always influences the dependent variable
b.
is the same for all groups in an experiment
c.
is influenced by the dependent variable
d.
is manipulated or varied by researchers

Option D

Explanation:

The scientific experiment is based on many steps. The factors on which the result of the experiment depends is the independent variable.

The independent variable can be defined as the factors that can be manipulated in order to get the accept the hypothesis or reject the hypothesis.

The result of the experiment can produce one or more than one result which is a dependent variable.

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: