To determine the identity of their biological parents, adopted children sometimes request DNA tests. These tests involve comparing DNA samples from the child to DNA samples taken from the likely parents. Possible relationships may be determined from these tests because the

2. DNA of parents and the offspring is more similar than DNA of non-family members.

Explanation:

Possible relationships may be determined from these tests because the adopted children have different DNA from their parents so the DNA test did not matched. It can only matched with the actual parents of the child. DNA test is a test which is done for finding the relationship of children to their parents or finding the actual parents of the child. This test is very efficient in finding the possible relationship because DNA of the individual did not change with the passage of time, it remain the same. This DNA test is also used in crime investigation.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation: