Identify the purpose of the open door policy. choose the best answer from the choices below.
a. to encourage free trade between european nations and the united states
b. to collaborate with other nations to maintain a common price level for free trade in china
c. to allow any country to trade with the united states with prices determined by market forces
d. to encourage other nations to engage in free trade with china, thereby improving its economy

Depending on the organism the number of in a cell may change

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

1. which of the following transport mechanisms utilizes energy? a. osmosis b. diffusion c. facilitated diffusion d. endocytosis