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Element X has seven valence electrons located in the second energy level. What is the group and period?
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The development of_ factored in the development of complex organisms.
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Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.
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A(n) is a molecule influences the way that a molecule reacts.
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Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed
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Element X has seven valence electrons located in the second energy level. What is the group and peri...
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