Dna extraction is a useful technique for scientists because it can be used a. to determine if people are related b. to absorb viruses c. to verify a person’s personality d. to see the nuclei of cells

The correct answer is A. To determine if people are related.

Explanation

DNA extraction is a scientific and medical technique developed to obtain the genetic identity of a being through one of its substances or tissues, for example, blood, saliva, hair, or a piece of skin. This method has been used in both animals and humans to establish a relationship between them. It has been used to classify species and in humans to establish family closeness as paternity, maternity or family closeness, because when two or more organisms are related their genetic identity its similar or equal. So, the correct answer is A. To determine if people are related.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.