Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. what percent (by moles) of he is present in a helium-oxygen mixture having a density of 0.518 g/l at 25 ∘ c and 721 mmhg ?

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

Answermuch larger;

Answer increases the risk of developing genetically influenced diseases;

Idon't  know if i got it wrong but i picked ( a )