8. Water regulation Describe how the body regulates water. In your answer include: the name of the organ and hormone primarily responsible for the control. Then describe how the following will affect the level of the hormone and how that would affect water retention vs water excretion. Describe what will happen if we overhydrate. Hormone level: How will this effect water control? What would be the response if we become dehydrated? Hormone level: How will this effect water control? What would be the response to ingestion of alcohol (in terms of hydration and hormone level)? Hormone level: How will this effect water control?

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Marine Evolution

Marine habitat is less explored, and hence, its biological diversity is far less known. The marine habitats are not constant due to their shifting nature, while the terrestrial habitats are more stable. Marine biology is the science that deals with the study of diverse marine species, their interactions, and behavioral characteristics.