Bacteria are microscopic organisms that reproduce rapidly and often cause disease.
Antibiotics are drugs given to people to cure bacteria-caused diseases. Since the 1950s,
scientists have observed that antibiotics cannot kill many kinds of bacteria. What best
explains the reason why antibiotics are less effective now?
(10 Points)
O
People today do not take antibiotics as directed by doctors.
O
Antibiotics used today are weaker drugs than those used in the past.
O
The genes of some kinds of bacteria make them resistant to antibiotics.
O
Doctors have increased the testing of patients for diseases caused by bacteria.

The kidney filters potentially toxic substances in the blood, and thus “clears” the blood of those substances. this clearance function is dependent upon and proportional to the diffusion gradient of the substance across filtering capillaries, i. e. if the concentration of the substance is doubled, twice as much will be cleared from each ml of blood that is filtered. suppose that the body produces a constant amount of a substance x per unit of time. the kidneys eliminate substance x at a rate directly proportional to the concentration of the substance and the volume of blood cleared each minute (c): elimination = c × [x], where [x] is the steady-state concentration of substance x. imagine an individual with an initial concentration of x equal to [x]0 who develops kidney disease. her baseline clearance c0 drops to one half of the original (½c0). what is the new steady state concentration of x? (for simplicity, assume that substance x is 100% filtered by the kidney).

Which organism in this food web is an omnivore?coati

Why do the circulatory systems of land vertebrates have separate circuits to the lungs and to the rest of the body?