Answer:
The cell theory developed most quickly due to the invention of the microscope. Robert Hooke was the first scientist who saw cells in cork. After this discovery, a wide numbered of researches were made and cell theory was developed. The basic cell theory explained that how every living thing was made up of cells. After this, a lot of additions have been made in the cell theory and today the cell theory is known to have five basic postulates.
Answer: Observe for changes
Explanation:
There are two different types of variable in an experiment. One is dependent variable and the other one is independent variable.
The independent variable are the factors which are changed in the experiment in order to observe the change and get the result of the experiment.
The changes in the independent variable changes the dependent variable and then observed change is the result.
So, the dependent variable that observes for the changes.
The dependent variable in an experiment will be the one that you _____;
D. Observe for changes
Anexperiment has three kinds of variables;
Independent
Dependent
Controlled
The independent variable is the one that the scientist changes so A is not an option.
The experimenter is to change the independent variable, thus, the change in the dependent variable is observed and recorded
Answer:
Building desalination plants and using rain gauges.
Explanation:
Using the process of elimination, seismographs are incorrect because they measure earthquakes and obviously earthquakes have nothing to do with droughts (ok, maybe a little bit). Snowplows are used to plow snow, so the remaining answers should be correct.