That process has progressed more slowly than anticipated.
None, however, have progressed more than centers like Fairview.
As biological science has progressed, these primitive ideas about body chemistry have been replaced by more complex ideas and by contemporary studies of hormones, neurotransmitters, and substances produced within the central nervous system, such as endorphins.
The field of complex trait genetics has progressed rapidly over the last 5 years.
As time has progressed, the technique has been refined and results have become more reliable.
Vestiges used evidence from the fossil record and embryology to support the claim that living things had progressed from the simple to the more complex over time.
Like Lamarck's theory it maintained that life had progressed from the simple to the complex.
Attempts to grow complex tissues outside the body have progressed in fits and starts.
In the case of progress and evolution, these might involve the examples cited above of how amphibians and reptiles benefit from an incompletely divided heart, or the fact that skulls and spines have become simpler rather than progressively more complex.
Through collaborative engagement in progressively more complex projects, the partners have made considerable progress in overcoming these obstacles.
