What are the motivations of the gods? Do they want the world to stay exactly the same as they make it, do they periodically redecorate but otherwise not want change, do they all agree about what to do with the world, or each have a territory, or send their creatures to battle opponent gods' creatures, or do they want the world to evolve and surprise them with the ways it changes while they periodically drop experimental creations into it to test them out and see how they interact with the rest of the world?
I'll try to answer this as well as some other questions (haven't quite figured out how to quote multiple people yet, hehe.
The gods do not want the world to stay the same. In fact, they are hoping that humans, on their own and given free choice, without nudging from the gods, will develop along a certain path and achieve a specific thing. That is the Ultimate Object of the game, at which point the world ends because they dismantle it and possibly start a whole new project.
Some aspects of the world (humans most of all) were a joint project, contributed to equally by the gods. Others are more one god's pet project or territory. There are three gods, two of which get along and the third one REALLY DOES NOT. But none are evil. However, one of them believes that one of the best ways to develop the human soul is through suffering, and so made sure the world was designed in such a way that Bad Stuff Would Occasionally Happen.
The rift among the trinity does have repercussions in the physical world. I haven't specifically delineated all of those yet, since I'm still struggling with the very basics of "can trees be blue" and stuff.
Which brings me to the chlorophyll question. What about the sun's spectrum makes green the best color? The physics of light/colors has always baffled me a bit. I'd assume that green leaves mean that they are absorbing red light? Are you saying that the sun's spectrum is mostly red? Is there any way that different areas of the world could
logically (not necessarily based on earth reality, but on logic for an alternate world) tend to manifest different colors in plant life?
Regarding memories of mankind when they were first created - this gets a little complicated but the easiest answer is, no, the first men had no memory. But it's kind of moot except for the fun of discussion, because no one alive in my stories actually knows anything about the first men. People alive at any point in my tale have various legends about the past and creation, but no one knows anything for certain.
And final question I think, if I have read back thoroughly: what is the gods' purpose, are they at cross-purposes, etc. A little of both. They are looking for humanity to achieve a specific thing, but using only the tools they were given when created. So humans have to develop civilization to a certain point and begin to put their heads together and figure out the patterns in the world around them, basically. The gods all want the experiment to succeed. HOWEVER, they all have vastly different ideas about what is best for humanity, and all try to "bend" the rules in varying ways to nudge things along when they feel like their theory is about to be proven wrong. One of them is particularly prone to rule-bending, when she thinks she can get away with it, and this always causes MASSIVE uproar in both the physical and spiritual world. My first novel (the WIP in my sig) is about what happens when one god decides to bend the rules just a little. Butterfly effect ensues.
By the way, I like the appendix example. Humans in this world would not have one. That is the kind of difference I'm talking about. Everything has a purpose, because nothing is just a "leftover" from evolution from a one-celled organism.