Two species of fish have been found together in five different lakes. the larger, bottom-dwelling species feeds on large prey close to shore. a surface-dwelling species feeds on small plankton in open water. dna analysis shows that the two species in each lake are more closely related to each other than they are to any of the other fish species in the lakes. however, they are reproductively isolated. these two species are likely to have arisen due to
a. allopatric speciation.
b. allopolyploidy.
c. sympatric speciation.
d. polyploidy.
e. autopolyploidy.

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.

Moving down the ramp from 6 meters to