Every class that teaches on the origins of the universe, or life, or species, should begin with this disclamer:
Class, we're now going to talk about origins. Now, science is based upon observations and obviously nobody has observed the origin of the universe, the origin of life, or the origin of a new species (change when that last becomes untrue). On the other hand, we have observed many things which may be extrapolated back in time to explain origins. As we discuss this subject I will be very clear as to what is observed and what is extrapolated and why scientists believe the extrapolation is valid. You may find, when we are done, that the subject has raised more questions than answers. In my opinion, that is good science.
Comments?
Shalom.
Of course, that last has become untrue. And even Answers in Genesis agrees that speciation happens.