Three students each added equal volumes of pond water to four beakers and placed each beaker in a different water bath. each student maintained the water baths at temperatures shown in the data table below. the students then added an equal number of water fleas to each of the four beakers. after one hour, the students used microscopes to determine the average heart rate of the water fleas. the procedure was repeated for a total of three trials at each temperature. the results of the investigation are summarized in the data table below. which component of the experiment above is the independent variable? number of trials water temperature average water flea heart rate number of fleas per beaker

water temperature

Explanation:

When performing a scientific experiment, you need to know what the dependent and independent variables are.

An independent variable is one that influences, causes a result in the dependent variable. This variable does not depend on any factor to be established.

The dependent variable, on the other hand, depends on the independent variable to be established. This is because this variable only shows one result, in relation to the influence that the independent variable had on it.

In the question above, we can see that the students were wanting to determine what the influence of water temperature was on the average heart rate of water fleas. With that, we can say that the water temperature is the independent variable.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

trachea, alveoli, lung capillaries, arteries