do you think elephants, lizard and fish were created more or less simultaneously
They are being created all the time. So, what you are asking then would be when the first one appeared. And, then the question has to do with what they are, whether we are talking about merely a certain morphologically similar configuration of molecules, or something more interesting, more real than that.
Elephants, lizards and fish differ in more than just their appearance, the adult physical structure that is related to the information contained within the first cell from which each individual specimen developed. That difference is more than the simple fact that they cannot mate to produce offspring. To recap, we have individual organisms that we can study in terms of their anatomy and physiology. We can also come to understand them in terms of instinctive properties. Elephants, lizards and fish differ greatly in how they perceive and organize their world and in their reactions.
So,what we are dealing with cannt be reduced to biochemistry, although it most definitely can be used to describe how the “brick and mortar” come together to form the “home” which they are.
Elephants, lizards and fish are not subjective illusions that we project onto material events happening within a contiuous physical field that would comprise the universe. Individual organisms exist as themselves. And, they do so as expressions of their kind of animal.
The problem with focussing on the material tip of the ontological iceberg that is any creature is that the actual relationships between them is missed and replaced by an illusion, that of evolution. What we have is the ongoing creation of new forms that fit in with what was created previously and utilizing what worked before. At any rate, the bottom line would be that there would have been a first creature of its kind, brought into existence as a new type of being, with a physical structure that defines it within the physical aspect of the world. What it is, is more than a change in morphology due to mutations in the DNA of a forebear, although this can describe how diversity can happen within a genus. The creation of a new kind of organism comes whole, from the beginning of that first creature to its death. That first expression of its kind might be thought of as having a pluripotential genome that enables the artistic and adaptive differences that develop over time between the original model and its offspring.
In other words, the question you ask, to me is not so much irrelevant to the process, but that it can be used to support a fallacy, that in terms of neoDarwinian evolutionary theory is that given enough time, things happening of their own accord will lead to a greater order if that which is not useful is cast aside. To get anything done requires work and organization, not only in human terms but with everything that exists.