Ascientist who is researching marshes observes that marsh grass, spartina bakeri, grows to different heights at different locations in the marsh. if the scientist wants to find the reason for this difference, what is the correct first step? conduct an experiment and change only one variable at a time. determine which technology would assist most in answering the question. form a research question based on knowledge of the marsh. establish a control group for comparison.

The scientist who is researching marshes and why they grow to different heights at different locations in the marsh first needs to form a research question based on knowledge of the marsh.

An experiment is a series of tests in which the effect of one variable on the other is observed under carefully controlled conditions.

Usually, in an experiment, the effect of one variable on another is studied at a time.

Research begins with formulating a research question based on knowledge. The research questions give birth to a research hypothesis which will eventually be confirmed or disproved by the experiment.

A control group must be set up during the experiment in order to establish the validity of the results obtained from the experiment.

The research question based on the scientist's knowledge of the marsh will guide the research.

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allowed for the prediction of the properties of missing elements.