While observing some ants, a group of german scientists noticed that the ants had an excellent sense of distance. wondering how this was possible, they decided to perform an experiment.

first, the scientists taught ants to retrieve food from a feeder placed near the ants' home. then, they removed the lower portion of some of the ants' legs to make them shorter. they also attached tiny stilts to some of the other ants' legs to make them longer. finally, the scientists watched the altered ants attempt to retrieve food from the feeder.

after several trials, the scientists found that the ants with shortened legs walked toward the feeder but stopped short of it. on the other hand, the ants with lengthened legs walked past the feeder.

which of the following conclusions can be made given this information?

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).

As the pea seeds respire, the level of coloured liquid in the left hand part of the capillary tube rises. by referring to what is happening in the apparatus, explain why the level of liquid changes

Consider the following reaction: 2h2 + o2 —> 2h2o a) what are the reactants in this reaction? b) what are the products in this reaction? c) how many molecules of oxygen are used in this reaction?