Question: Quadric Surface graph and its trace

The equation of a sphere is x^2+y^2+z^2=1, and its traces are x^2+y^2=1-k^2 z=k x^2+z^2=1-k^2 y=k y^2+z^2=1-k^2 x=k can somone help me how to graph the traces using spacecurve command so the traces matches the sphere? thx!!
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