I think it was the creation of natural rights and the Declaration of Independence. These ideas were ignited during the Age of Enlightenment, wherein people learn to reason and rationalize the things and situation around them. They were able to hone the idea of democracy as well as improved the idea of government, which pave way to creation of constitutions and city-states
Carries oxygen from pulmonary alveoles to tissue and returns carbon dioxide from tissue to the lungs. and has Fe ions that gives blood the specific red color. and veins specific purple red color is given after oxygen is realesed to the tissue by oxihemoglobine ( at low ph and high temperature because at those conditions the hemoglobine capacity of bonding dicreases) .
Answer:
Avoid technical jargon as much as possible and use interesting metaphors or stories
Let's say there is a mother wolf watching her young and she see's a predator coming her communication would be to howl for her pack and behavior change would become for supervising to defensive
