Answer:One explanation is that Mia and Thalia are identical twins, whereas Esther and Hannah are fraternal twins.
Explanation: according to research identical twins are likely to share more common personality traits due to the fact that they originate as one egg which split into two which means they are more of the same person but fraternal twins are less likely to share similar personalities due to the fact that they are more of an independent individual. This is just one of the explanations but there are also so many things that plays role into personality development such as upbringing, environment and other many factors.
Explanation: The similarity exhibited by Mia and Thalia in terms of opennes, that is being frank, sensitive and welcoming could be explained by the fact that they are identical twins, thus inference is made because IDENTICAL twins are usually monozygotic, that is they both form from the fertilization of a single egg and therefore share all of their genes. Esther and Hannah on the other hand could be inferred to be FRATERNAL twins as they both are formed from the fertilization of separate eggs and therefore do not share the same gene.
Snowball sampling is one where the researcher gets a sample by asking participants in the study if they know other potential participants. The current participants refer new ones.