In some chordates, pharyngeal slits develop into choose one answer.
a. gills.
b. vertebrae.
c. blood vessels.
d. fins.

20 the compound al(nh3)2 has atoms of nitrogen.

Along what geographical feature are most of the oil producing regions located

Suppose you are provided with an actively dividing culture of e. coli bacteria to which radioactive thymine has been added. what would happen if a cell replicates once in the presence of this radioactive base?