Oh wow yes i is coming back up here for the night at the night so we will have a sleepover tonight so
Here's a few things: Early settlers hunted their own food/ harvested their own food. They also made their own tools, weapons, clothes, means of transportation by hand and with the materials of nature surrounding them. Hope this helps!
Let us choose Extra study. Knowing that opportunity cost is related to the opportunities lost by choosing one specific course of events than others. By choosing an extra study and spend hours studying something, my opportunity cost will be the school sports practice hours that could be spent in this time. Another opportunity cost would be the social interaction, in a club, for example, lost because of the extra study decision.