What is needed for successful bartering between settlements?

the ability to travel between towns.

Explanation:

Colonial settlements produced enough goods or products that were bartered with another settlement. It was extraordinary to get the goods they needed and to give the goods they produced. However, something that was needed to make that bartering successful is the ability to trabel from one settlement to the other. The distances and the weight of the goods were two of the factors that make bartering impossible if means of transport (of that time) and roads were not available.

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation:

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.