What factor causes the dna fragments to move in this technique

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.

Which of the following explains why a tree is often used as a model to represent the principle of common descent