I believe Clinical psychology is the branch of psychology that focuses on mental illnesses and their preventions.
Trade is how countries cooperate with one another through the exchange of production. Trade helps all civilizations gain access to goods and services that are not produced domestically.
Nations can specialize in what has the advantage of production and import what they can not produce or produce inefficiently. In contrast, the nation can export the good it produces. This is how commerce works.
Trade negotiations take place through agreements between countries and through contracts between traders and buyers. These are ways to give security to both sides, ensuring a trade-prone environment.
The correct answer to this open question is the following.
Although you forgot to attach the options for this question we can answer the following.
Three of the common characteristics of hunter-gatherer communities are their communities were small in size, they possessed knowledge of plants and animals, there were no divisions in communities of age and gender.
Hunter-gatherers were nomad people who followed the herds to hunt them. Until humans learned to developed agriculture techniques, they could settle in one place to grow crops. They used pointed tools for cutting that made of different materials, and they shaped these tools for different purposes.
