Which statement best describes the role of the nervous system? * 5 points
collects waste produced by cells and removes it from the body
O it breaks down food, absorbs nutrients, and gets rid of solid waste
O
the network of nerve cells and fibers that transmits nerve impulses between parts of
the body
O
brings oxygen into the lungs and releases carbon dioxide and water (waste materials)
from the body.

The first element on the periodic table of elements is carbon. a. true b. false

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

Which three statements represent the benefits of performing experiments using computer simulations?