Scientists have found y containing fossilized cyanobacteria (blue-green algae). They show that life has been present on the
Earth from early ages. Oparin and Haldane were two scientists who hypothesized that life needed reducing environments Initially to
appear. The ocean in the early ages was
(devoid of oxygen) and acidic.

the answer is d.) homologous; have mammary glands

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.'

i am sorry but i need more information and a picture.