Which of these is a concern with respect to using fuel cell cars?
o use of non-renewable resources
o cost of the distribution network
battery recharge or replacement
reliance on petroleum products

Cost of the distribution network  

Explanation:

The cost of building a distribution network is the major concern. Each refill station costs about $1.5 million.

A is wrong. Hydrogen comes from water, which is plentiful in the oceans. When hydrogen reacts in the fuel cell, the water is re-formed

C is wrong. The fuel cell will last for about 300 000 km.

D is wrong. Although hydrogen can be produced from petroleum, water is the most likely source.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.