The disease known as Sickle Cell Anemia is recessive. In order for a person to have this disease, he/she must have two copies of the recessive allele. Individuals with only one copy do not display symptoms of the disease. Which of the following individuals has the GREATEST chance of having this disease? *

The ones with 2 recessive traits

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.