The human body can perform anaerobic respiration for short periods of time. however, the body will eventually die if it does not switch back to aerobic respiration because anaerobic respiration

causes alcohol to accumulate in the body

causes lactic acid to accumulate in the body

produces far more atp than aerobic respiration

produces far less atp than aerobic respiration

Nucleus is the organelle that contains chromosomes

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.