Use the drop-down menus to set the scene.

What protects the lining of the stomach from acidic gastric juices?

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?

As a small change in a person's dna can cause a genetic disorder