Your intestine is lined with individual cells. no fluids leak between these cells from the gut into your body. why?

Because of the tight juntions that join the intertinal apithelial cells.

Explanation:

The intestinal epithelium is formed by epithelial cells sealed by tight junctions (cell-cell junction), this layer keeps the contents of the intestine inside it and at the same time, it regulates the permeability of nutrients through transcellular transport allowing to selectively transport molecules.

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for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.