Severe acute respiratory syndrome (SARS) is an illness caused by a coronavirus. Symptoms including high fever, headaches, and body aches typically occur 24 – 72 hours after infection by the virus. SARS is more serious in elderly patients. This information suggests that the reproductive cycle of the SARS virus is —

Rna polymeras should attache to the promoter.

It would be the equator.

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.