Stem cells that are found in the developing fertilized egg after it has formed a blastocyst. a.) adult stem cells
b.) embryonic stem cells
c.) white blood cells
d.) bone marrow cells
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Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis