Which of the following is an example of gene splicing? A. a segment of human DNA is inserted into the DNA sequence of a bacterium B. a genetically identical copy of an entire organism is produced through cloning C. two human chromosomes pair up during meiosis and exchange parts of their DNA D. a mutation that occurs during meiosis results in a chromosomal abnormality

The right answer is c.sandstone.

A

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.