Final answer:
The true statement about feedback is that it has both positive and negative effects. Feedback can be verbal or nonverbal and is important in various contexts, including personal relationships and biological systems.
Step-by-step explanation:
The statement about feedback that is true is number 4: Feedback has both positive and negative effects. Feedback is not always verbal; it can also be nonverbal. Contrary to the second statement, nonverbal feedback doesn't elicit only negative effects; it can convey a range of emotions and reactions, some of which can be positive. Feedback can be beneficial in both weak and strong relationships, which refutes the third statement. Understanding the nature of feedback is essential, as it can influence the dynamics of a relationship significantly. For instance, in romantic relationships, frequent communication through messaging can increase attachment, however, it's also found that an over-reliance on text messaging might lead to a perception of weaker relationship quality. Furthermore, in biological systems, as per Advanced Placement (AP) Biology curriculum, alterations in feedback mechanisms like negative and positive feedback loops can have crucial consequences for the organism's homeostasis, supporting the idea that feedback can have varying effects. The balance between delivering straightforward feedback while maintaining diplomacy is a skill valued in many professional environments.