Which research source is an example of a primary source

In the united states, the percentage of children and adolescents affected by obesity has more than tripled since the data from 2015-2016 show that nearly 20% (1 in 5) school age children and young people (6 to 19 years) in the united states has obesity. this is do in part to the fact that younger people consume beverages containing high levels of sugar and products containing high levels of fat. consuming too many calories and not enough exercise are also issues. as a well known industry consultant you know many of the beverage industry executives. you are approached by a coke executive who tells you that someone from coke is unofficially willing to sell pepsi the coke formula and the coke marketing plan for $25 million. the individual has access to both the vault and the bottling equipment so they can get the formula and marketing documents with nobody at the coca cola company knowing. imagine you are a marketing consultant. discuss fully your concerns. what is the ethical dilemma? is it illegal to purchase the coke formula and marketing plan? explain fully your point of view. furthermore, what would you tell the executives regarding childhood obesity?

In e. c. tolman's experiment, some rats were trained to run through mazes for standard food goals, while other rats were allowed to explore the mazes for 10 days without food goals or other rewards. later, when food rewards were placed in a box at the far end of the maze, the previously unrewarded rats reached the food box as quickly as the rewarded rats after only one or two trials. this experiment demonstrated that the rats had the ability to form of their surroundings.

How has our understanding of the first sentence of the declaration of independence changed over time?