Here, given-
homozygous alleles 'a' have a frequency of 0.3.
Also the alleles are in equilibrium in a Hardy-Weinberg population. The frequency of individuals that are homozygous for this allele are= 0.49.
The Hardy-Weinberg equilibrium can be defined as the principle which states that the variation in the genetic makeup of a population remains constant and unchanged till there are no external interferences, influencing the population.
Calculation-
Then to find the frequency of the individuals homozygous for this allele the following formula needs to be used-
Thus, the individuals homozygous for the allele can be calculated by 
Learn more about the Hardy-Weinberg equilibrium here-
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The Kidneys.
The plasma passes through the kidney where it is filtered, a special filtration unit called "glomeruli" and then excreted as a low molecular weighted product into the urine. The purpose of our urine is to secrete waste products from the body. So you can see how the glomerular filtration mechanism of the kidneys plays a major role in the function of our bodies. The primary function of our kidneys is to filter out all the "bad stuff" in lamest terms.
-Current Medical Student (College Level)
Based on this observation you would predict that the MISFOLDED BETA AMYLOID PROTEINS COULD NOT BE REFOLDED BY THE CHAPERONE PROTEINS.
Chaperon proteins are proteins which assist newly formed proteins to form correctly. A protein that is already mis-folded can not be refolded by the chaperone proteins.
D) the earthworm measurement is accurate because moore subtracted the beginning and ending points from the ruler
