Arrange the statements below to describe how a lake might become a forest in a period of 100 years. Fill in 1 to 5, 1 being the first to occur. (It's not 5, 4, 3, 2, 1) __ These processes continue until the lake is replaced by a forest.
__ Seeds from trees are dropped on the shore and trees begin to grow.
__ Pine needles, leaves, and branches from shoreline trees drop into the water thereby reducing the lake and expanding the shore.
__ Lichens and bacteria break down rocks near the shore into soil.
__ Lack of rain results in reduced water levels and an expanded shore.

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

Variety of living organisms; includes genetic, species, and ecological types.

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).