Which of the following is a chemical reaction?

a.
breaking a glass pane
b.
freezing water
c.
digestion of food
d.
cutting down a tree
e.
evaporation of rubbing alcohol

C. Digestion of food

The answer is C because the rest of the answer choices are all physical reactions. In your stomach, food is chemically broken down by different substances.

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x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'