Which of the following cannot vary for a particular element?
a. atomic number
b. atomic mass
c. number of neutrons in the nucleus
d. atomic charge
a
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Limitations on the use of surface water as a water source include
A. past use of some lakes and streams for dumping wastewater. B. seasonality of stream flow. C. basic lack of surface water in some regions. D. All of the choices are correct.
X-rays are not used to study the geology of Earth. Why?
A) X-rays only penetrate living flesh. B) Mineral matter is not transparent to X-rays. C) X-rays do not extend to required distances of study. D) X-rays do not produce three-dimensional images.
Which field was the control group?
A) The west field was the control group. B) The east field was the control group. C) Both fields were controls for one another. D) There were no controls in this experiment.
What compound is the primary structural constituent of plant tissue, forming the cell walls of stems, leaves, and roots?
A) chlorophyll B) starch C) protein D) enzymes E) cellulose