Which of the following variables present in redi's experiment on spontaneous generation is not a
controlled variable?
a. gauze covering that keeps flies away from meat
b. types of jars used
c. types of meat used
d. temperature at which the jars were stored

this protocol provides a detailed procedure for agarose-based ip to purify and enrich the protein of interest.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.