A surrogate mother donates her uterus to assist another woman who cannot become or stay pregnant because that another woman has some problem in getting her eggs produced or in getting fertilized.
Surrogate is a process in which a woman's egg is getting fertilized artificially with the sperm of a man who belongs to a couple. After the egg gets fertilized then, that fertilized egg is transferred to the uterus of a woman who belongs to above mention couple.
So a third person will help a couple to have a baby, and that third person is called a surrogate mother who donates his uterus. This surrogate mother is called a biological mother.
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Since training and stretching for flexibility is a physical activity, I would say yes you should record it.
Frequency intensity time and type of exercise
A phrase to describe a negative feedback loop could be: self-regulating (though I'm not sure the exact word you're looking for).