The sugar pill serves as a control.
The control in experiments is a sample that remains the same throughout the experiment and it is used to compare the results of the main experiment to. It serves to guarantee that changes noted in the experiment are from the variables introduced and not something else.
Bacteria in general grow optimally when the pH is around 7 (5-9 let's say). That is not to say that there are not bacteria that grow in extremely acidic conditions, like in our stomach, or others in extremely basic conditions, like the conditions near volcanoes. Nonetheless, bacteria that grow in food prefer acidic environments over basic ones and usually cannot tolerate the acidity of fruits which is around 4 pH for the most acid ones. For example, stuff like milk and bread that have a pH from 5-6 are prime examples of food where bacteria would thrive. Thus, the correct answer would be b.
Answer:
shortest wavelength of visible light: Violet
Energy that can be felt as heat but can't be seen: Infrared radiation
Short invisible rays that can cause damage to the eyes: Ultraviolet light
visible light with the longest wavelength: red 700
Explanation:
Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.
The one-leg stand test is something the cops do to people when they pull them over depending on the way that person was driving to tell whether you were under the influence of alcohol or drugs.
(Speaking from experience)#dontgetcaught
The answer is B)Atmosphere
