The integumentary system is the skin. Skin protects the inner organs from Bactria. Essentially the skin is a wall protecting against the outside world. It doesn't really release anything but is just there for protection.
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A. In prophase I, tetrads of homologous chromosomes form and crossing over occurs
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Explanation: If the rate of photosynthesis increases, then the number of bubbles will increase.
There are many reactions, like Oxidation and Reduction