Life: that property of plants and animals which makes it possible for them to take in food, grow, adapt themselves to their surroundings, and reproduce their kind. From Middle English lif, life, from Anglo Saxon, lif, life
Reference: Webster's New Universal Unabridged Dictionary.
This term has not changed for many years. It is one of those root words like mother or sky that goes far back to the origins of our language. Even though we may still have a difficult time defining exactly what contstitutes life, we have had an intuitive understanding of "what is life" since we became humans, and we put voice to it early on......
What to better symbolize life than a sunflower and a person - the bottom and top of the food chain! Energy captured from the sun and passed along to animals. Water and minerals taken in, converted to living cells and then recycled back into the environment....it sounds pretty simple, but the reality is a bit more complex.......