Ross is conducting an investigation in which he has grown three bean plants in three different pots. Each pot is similar in size and contains the same amount and type of soil. Be watered Pot 1 with 50 mL of water per day, Pot 2 with 70 mL of water per day, and Pot 3 with 100 mL of water per day. He put the pots on a sunny windowsill and measured the growth of each plant after a week. He recorded his observations. Which question is Ross trying to answer through this scientific investigation

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above

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).