Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. the steps of the experiment are listed below. select one location to collect water samples in the pond. collect a 5-ml water sample at 8 am for two days. measure the amount of pesticide present in each sample using the same measurement tools. after analyzing their data, the students conclude that pesticide runoff from farms is not causing the fish to die in the pond. which of these statements best describes why their conclusion is not reliable? 1)the pesticide measurements were the dependent variable. 2)the samples were collected at different times. 3)the samples were only collected for two days. 4)the time of sample collection was not an independent variable.

1)The pesticide measurements were the dependent variable.

Explanation:

The aim of the experiment was to determine whether the pesticides caused the fish kills. In this scenario, the dependent variable should have been the fish kills and not the pesticides. The amount of pesticides were supposed to be the independent variable.

Independent variables are the variables that change and cause an effect on the test subject or the dependent variable.

The dependent variable is not manipulated, but changes depending on the independent variable.

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hi my name is ashlynn and im 15

these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.