The zygote and early embryo consist of
a. undifferentiated cells, known as stem cell or progenitor cells
b. cells that are specialized to become particular organs, such as brain, skin, liver, heart or intestines
c. cells with 23 chromosomes
d. cells that are specialized to become particular body regions, such as abdomen, head, arm or leg
Answer: a. undifferentiated cells, known as stem cell or progenitor cells
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Which part of the brain is the likely location of the tumor? a) thalamus b) hippocampus c) hypothalamus d) corpus callosum
According to Piaget's theory, during periods of rapid cognitive change, children
A) shift from accommodation to assimilation. B) shift from assimilation to accommodation. C) equally balance assimilation and accommodation. D) are in a state of cognitive equilibrium.