interact

1 - Social media such as Facebook and Twitter is often viewed as having a negative impact on social interaction and development.

2 - Many birds that form flocks compete through aggressive interaction (mutual or reciprocal action or influence) for priority of access to resources such as food and shelter.

3 - There is a considerable body of research showing that eye contact is a key component of social interaction.

4 - Physicists and chemists are concerned with basic laws, properties of substances, and changes in properties caused by interaction of different forms of energy.

5 - An interactive role play game which helps children to cope with bullying at schools has been developed.