Farmer brown believes that increasingly large doses of antibiotics will produce increasingly large beef cattle. what is the correct match between experimental variables and activities in farmer brown's experiment?
a. dependent variable; all cattle receive the same hay, water, and living quarters.
b. control variable; different groups of cattle are given different doses of antibiotics.
c. independent variable; farmer brown tests only antibiotic x in even incremental dosages.
d. hypothesis; farmer brown observes that dosage with 500 mg of antibiotics produces the most weight gain.

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip. nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule. true/false

Describe five factors that influence the value of fuel

Me . based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?