In view of bohr's explanation of the link between emission spectra and electron transitions, answer more fully the question, "what does each line represent in the emission and absorption spectra of an incandescent gas? " use at least 130 words to answer

The emission spectrum of atomic hydrogen is divided into a number of spectral series, with wavelengths given by the Rydberg formula. These observed spectral lines are due to the electron making transitions between two energy levels in the atom.According to Bohr's explanation, the lines of an emission or absorption spectra of an incandescent gas are representative of the energy radiated from the hydrogen atom. When an electron moves from one energy level to another lower level it releases or radiates, the differences in energy between the two separate energy levels. This released energy, as mentioned, is displayed as a bright-line. Each of these individual lines also represents a different color of light, and therefore a different wavelength and frequency. 

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.

Dna strands are split apart to allow an opening for replication. the opening has two replication forks so synthesis goes toward them in 5' to 3' direction.