Two disinfectants were tested for their effectiveness against a strain of bacteria. Disinfectant A had a clear circle with 3 mm diameter. Disinfectant B had a clear circle with 6 mm diameter. Calculate the difference in the bacteria-free area between disinfectant A and disinfectant B.

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Fill in the blank with the correct sphere label. a: ⇒ geosphere b: ⇒ biosphere c: ⇒ hydrosphere