8 has lines of symmetry.
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I don't think a human foot has any lines of symmetry. I don't know about other species.
It has no reflection symmetry because the white diagonal lines are thicker on one side than the other.
For a right isosceles triangle (45-45-90), there is one line of symmetry that bisects the hypotenuse. For all other right triangles, there are zero lines of symmetry.
It would depend on the number of petals. For instance if a flower had five petals, it would have five lines of symmetry. You could divide it five ways (with lines) and each time you divide it each half is even with the other.
One or none.