El hueso en su comienzo es cartílago y al pasar de los anos se endurece.

Before the can be observed by using a transmission electron microscope, cells are sliced into very thin sections. what disadvantage does this procedure present in the study of cellular parts

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

The response is the basis for vaccination. primary secondary tertiary none of the above