Observation the action or process of observing something or someone carefully or in order to gain information:
The choices can be found elsewhere and as follows:
<span>a) mixture called a suspension
b) mixture called a solution
c) solution and suspension
d) mixture only.
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I believe the answer is option B. If you stir salt into boiling water, you produce a mixture called a solution. Hope this answers the question. Have a nice day.
Answer:
at right angles or perpendicular to the direction they are moving
