A、week 4 of embryonic life
B、month 5 of fetal life
C、birth
D、At puberty
A、week 4 of embryonic life
B、month 5 of fetal life
C、birth
D、At puberty
The significance of embryonic stem-cell research lies in______.
A.great expectations
B.planting into any tissue or organ
C.the treatment for a lot of human diseases
D.curing diabetes and Parkinson's disease
A、embryonic gill slits, reflecting our evolution from fish
B、embryonic precursors to gills, which do not continue to develop in humans
C、embryonic precursors to structures predominantly in the jaw
D、embryonic structures that develop into the ribs
A、zygote
B、myocardial cell
C、bone marrow stem cell
D、embryonic stem cell
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