Vince's claim is a way of showing certainty. It is an expression of which a person has a total belief of something and he or she would likely believe that is going to happen for sure. It could be seen above as Vince expresses his words in a way that he is sure that he would be married without using words that he is uncertain but instead he is sure of it.
Native Americans have been hunterers and gatherers up to the period when growing crops became available to them/when they discovered growing crops is a thing that could be done. The reason for this is that when you've started growing crops, you can safely stay on one spot and have a sufficient supply of food for a longer time period - this wasn't available before. However, even with the coming of agriculture, the still hunted and gathered as it was an important aspect of their life.
Well if the question just says river and lakes contain. The answer could be wildlife.
