As scientists have developed more productive crop varieties, farmers have switched from growing many traditional varieties to new high-yield varieties. For example, in Peru, the Indians once grew 500 native varieties of potatoes. That number has been reduced to about twenty major potato varieties, worldwide. Why is it potentially dangerous to reduce the number of crop species in potatoes?
October 24, 2018
Environment, health, nursing, and person interconnect to comprise the metaparadigm of the nursing discipline
October 24, 2018
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The yellow box represents a cell with a semi-permeable membrane. The small, blue dots represent molecules of water, and the larger, gray dots represent a solute such as sugar or salt. The membrane is thin enough for water to pass through, but it is not thin enough for the solute to pass. What will happen to the substances in this diagram to bring the concentrations closer to equilibrium?

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