The main difference between ponds and lakes is that ponds a. are inland bodies of water b. do not develop self-contained ecosystems c. are smaller than lakes d. have easily observed currents

The answer to this is option c, my dudes! I got it correct on the quiz. I hope i helped u!

Countries trade with each other when, on their own, they do not have the resources, or capacity to satisfy their own needs and wants. By developing and exploiting their domestic scarce resources, countries can produce a surplus, and trade this for the resources they need. You can integrate all of this into your question. Hope this helped.