How do you use iron in your daily lives?

Which atmosphere gas is essential for human survival? Diffence between fermenter and fermentor? What is the name for bits of unburnt carbon? What is an example of each kind of noun? Where do scientist acquire evidence? How many liters of liquid are in 1 meter cubic volume? Why SETI examines radio wave rather than other electromagnetic spectrum? Does 54cm equal 5.4mm? How do opposing pairs of muscles behave during movement? When both the researcher and the participants do not know whether the participants are in the experimental or control group it is known as a? What is the function of amnotic fluid? How much energy does it take to heat water by degrees C? What is a method of answering scientific questions by testing a hypothesis trough the use of a series of carefully controlled steps? How many decimeters are in a decameter? What process did Darwin's book suggest that organisms evolve through? What helps scientists make a hypothesis of collect data? How does sound made by a virbrating object travel? Can you use any alternate material for 40Cr4 Type B forged steel that will lower your material cost? What tests help you to keep viruses that haven't been defined yet? Description of test tube holder?