Let’s clarify what this means.
We are descended from Adam in the sense that we are all expressions of one humanity, which began with one person, becoming two - male and female.
Hominids were animals. We have livers, hearts, bones, skin and brains as they would have. We have similar emotional reactions - fear, anger, sexual desire.
Similarities do not imply descent. Your great grandfather and I might bear many similarities but I am not descended from him.
While I am “descended” from my parents, no part of them is in myself other than that which I have taken up, such as morals, personality characteristic and attitudes. As to what I got physically, any atoms and molecules that once belonged to their bodies are very much gone replaced by the the myriad of those that were the physical bodies of numerous living organisms I have ingested during my life, with some salt and oxygen added.
So we are created as individual and unique expressions of humanity, first brought into existence in Adam. Adam could have been created in any number of ways, which we cannot know through science.
Hominid organisms can be understood to have been a primates, with their particular physical characteristics and instinctive behaviour diverging from that of others. Each as an expression of that particular soul would have been created in a similar manner as we were, and as all life.
It is all about creation, here and now and in every other moment, from One eternal Source.
There are breaks between the different kinds of living forms. The continuity exists within each true “species”. That the information contained in simpler forms is used to create those more complex is not a true continuity. It is an illusion that appears when one sees only the material neglecting what things are like in themselves.