Which line of text implies that Xavier was scared? "Hey kid," Hillary called, "It's OK. Don't worry. We'll help you." Flailing and screaming, Xavier disappeared briefly beneath the waves… Simon dove beneath the surface to grab him as Hillary clung desperately to his board. They helped the little boy onto Hillary's board and together the trio paddled toward the beach.
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when the text says "Flailing and screaming, Cavier disappeared briefly beneath the waves..."

Explanation:

This quote, most likely implies that Xavier was scared because a scared person would be concerned and that his screaming shows that he is in distress and not safe.

if interdependence implies a two-way dependence, and if each partner is equally dependent on the other for success, then there is an equal commitment to the making the partnership successful. the advantage is sustainability of the relationship, the disadvantage is that decisions are "democratic" and therefore may take longer to reach and more likely to be a compromise (which is not always the best solution). as the interdependence moves away from equality, the decisions become more influenced by the more independent partner. in the extreme the relationship becomes more dictatorial and more like "master-slave". generally the relationship has less commitment in both directions and is more likely to be temporary.

if one generalizes (and one shouldn't), equity partnerships, which is probably what is implied by interdependence, can be slow to progress or change but durable. the extreme alternative, independent-dependent partnerships tend to be efficient but more fragile.

hope this but you will have to site your own evidence. : )