Why can organs be members of more than one organ system?

Because some organs rely on other organs to operate.

Explanation:

For an example, your entire body relies on your brain to give it orders. Your brain controls every part of your body, and without your brain you would most likely not be alive.

Another example would be your digestive systems. Your intestines rely on your stomach to break down your food (what's passed down to the intestines are referred t as waste).

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.