I think you forgot to give the options along with the question. I am answering the question based on my research and knowledge. The primary concern of developmental psychologists is the <span>changes that occur throughout a person's life span. I hope that this is the answer that has actually come to your help.</span>
The answer is primary circular reactions. This substage includes planning sensation and new patterns. For instance, a kid may suck his or her thumb unintentionally and afterward later purposefully rehash the activity. These activities are rehashed in light of the fact that the newborn child discovers them pleasurable.
Observing behavior in real-world settings and making no effort to manipulate or control the situation is known as naturalistic observation. It is a research method that is most used by psychologists which they observe their test subjects in thir natural habitat without changing any parameter.
Answer:
For the first time, genes chemically silenced by stress during life have been shown to remain silenced in eggs and sperm, allowing the effect to be passed down to the next generation.
<u><em>Hope this helps :)</em></u>
<u><em>Pls brainliest...</em></u>
