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During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

What are modern-day treatments for schizophrenia? how is treatment better today than 50-60 years ago? what are some of the obstacles that a person with schizophrenia faces? are there any natural treatments?

The acts as the internal clock that controls sleep and waking cycles. a. hypothalamus b. pineal gland c. ovaries d. thyroid