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

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

How can active reading strategies you? o a. they can you get into better physical shape. o b. they can you read fewer science articles. o c. they can you understand what you read. o d. they can you avoid reading altogether.

Aplant may open end close its stomata to prevent excess water loss and maintain