These are good questions. I will try to answer them in the frame of how I see things. To start: Think of anatomy. Each part of the body serves a function in coordination with each other body part. All organs work together to create a "Darwinian" being (a "biologically successful" one that goes on to mate). Each organ has been finely tuned through the process of natural selection, in a rather beautifully intricate fashion.
Let us consider the brain. What is its function? It deciphers reality so that we can function more efficiently as biological beings. The limbic system evolved to drive animals toward sexual and resource-aggrandizing ends, the visual cortex evolved to discriminate environmental stimuli, the parietal lobe to coordinate motor function for those things we are resolved to do. The brain is a biological tool, it is designed to sustain the homeostasis of the body which it resides in, as well as propagate the genes from which it was derived.
What is exceptional about the human is that its brain became the basis of its survival and ability to reproduce. Physically, the human is utterly pathetic compared to lions, or wolves, or chimps, etc. But we have become the "dominant animal" because evolution streamlined us toward a sort of hyper-brain development.
Humans have not only evolved to be self-aware—they have also developed the intellectual capacity to wonder about who they are, and what reality itself is. And so they begin to ponder the mechanisms of their own minds, as well as their own mortality. The search for "higher meaning" is simply satiation of the desire to find something emotionally purposeful in the schema of life. It is the extension of our natural drive to make sense of reality itself and how we fit within its framework.
You can ask away about life's purpose, but there are no answers. You ask that question in an attempt to structure your reality in relation to your mortality, but there was never any actual purpose to begin with. Purpose itself is a human interpretation of causality; there is no such thing as "purpose," purpose actually just an idea.