Which of the following was a major milestone that allowed for greater diversity of life during the paleozoic era?
1.many marine animals became extinct.
2.photosynthetic prokaryotes produced more oxygen.
3.animals moved from the sea to the land.
4.reptiles became more diverse.

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.'