I have made the observation that most every plant when it shoots from its
seed with its first leaves, that these first leaves are rarely (perhaps never)
the same as what all the other leaves of this plant matures into.

Either you slept right through high school biology, or you should sue the
teacher. The first leaves on nearly every one of the flowering plants are not
true leaves. They are the cotyledons, or seed leaves. They come from the
endosperm in the seed. They contain concentrations of sugar and/or starch to
feed the baby plant until it has enough roots & true leaves to feed itself. If
you want an analogy to the animal world, it is the exact equivalent of the yolk
sac on a baby fish.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)