Circles not showing up in D3 Scatterplot

Circles not showing up in D3 Scatterplot
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#1

See the Pen D3 Scatterplot by Kristian (@Kristians) on CodePen.

Not sure why the circles aren’t showing up in the scatterplot. I’ve also been trying to figure out why I can’t get any ticks on the y axis. Really appreciate any help.