The table in figure 12-3 shows the results of measuring the percentages of the four bases in the dna of several different organisms. some of the values are missing from the table. based on chargaff's rule, the percentages of guanine bases in chicken dna should be around .

a. 28.8%
b. 19.9%
c. 21.5%
d. 13.4%

Explanation:

The table for this question is attached as image

Solution -

As per  Chargaff's rule the amount of base  molecule of DNA must be equal to their complementary bases.  

For instance the amount of adenine must be equal to amount of thymine and amount of guanine must be equal to amount of cytosine and the amount of these two base is never equal to each other.

Thus, in the table if % of cytosine in chicken’s DNA is 21.5 % then the guanine % would be also 21.5%

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.

Ithink the answer is c. i’m not sure though i’ll notify you when i have an exact answer!