A scientist uses materials in her lab to separate DNA fragments by size. What process is she using?

A. Polymerase chain reaction (PCR)

B. Gel electrophoresis

C. Use of restriction enzymes

D. Karyotyping

Landfills are waste disposal sites. they are often man-made depressions in the ground covered with a lining designed to prevent any leakage of waste materials. however, landfills can leak through the base resulting in negative impacts on the surrounding environments. what negative impact to the environment is caused by organic and inorganic constituents that are dissolved by rainfall in the landfills?

Talking listening and reacting non verbally are all part of communicating

Ais a group of individuals of the same that exist together in the same place at the same time