Detergents can be used to reduce microbial concentrations and all of the following are true except:
a. they are polar molecules that act as surfactants.
b. the most effective ones are positively charged. in low concentrations they are bacteriostatic.
c. they are ineffective against the tuberculosis bacteria.
d. they are active in the presence of organic matter.

Time ! for a smell to begin the process of registering in your brain, first you must a) inhale odor molecules into the nasal cavity b)transduce scent chemicals c)have a scent to inhale d)all answers can work

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

Select the star life cycle that is accurate