Three kinds of waste that the body will get rid of through the excretory system

Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

Development has provided electrically for less money but what may be considered a cause of nuclear power

Creating new things to solve problems and improve life depends on the close interaction of which two fields?