B. A teacher travels each year to visit family in South Africa.
Embryology, or the study of embryos, can help us find plenty of evidence to support the theory of evolution. For example, vestigial structures such as tails or gills in humans can be found in embryos early during their development.
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So for years, scientists have been trying to use cloning techniques to make embryonic stem cells that are essentially a genetic match for patients. The idea is that such a close match would prevent their bodies from rejecting the cells. "It's been a holy grail that we've been after for years,"
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