Which chemicals are used to cut dna into fragments for a gel electrophoresis procedure?
(1) enzymes (3) hormones
(2) molecular bases (4) atp molecules

1. Enzymes are used to cleave DNA into fragments for gel electrophoresis

The salt in the sea water dehydrated the sailor because her body could not take in the amount to salt in the sea water

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.