Aresearcher recently discovered a new species of bacteria in the body of a tubeworm living near a hydrothermal vent. he compared the dna of this new bacterial species to the dna of four other species of bacteria. the dna sequences came from the same part of the bacterial chromosome of all four species. according to these data, the unknown bacterial species is most closely related to:

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.