Question

what are these shells illustrating? they are all the same species (polymita picta).
that there is variation at the species level
that there is no true variation in individuals
that all individuals might look different but have the same exact genome
that there is variation in the level of the individual

Explanation:

The shells shown are of the same species (Polymita picta) but display different colors and patterns. This indicates variation among individuals within the species. Variation at the species level would refer to differences between species, which is not the case here. The statement "there is no true variation in individuals" is incorrect as the image clearly shows differences. If all individuals had the same exact genome, there would be no such visible variation (barring environmental - induced changes not indicated here). So, the key point is that the visible differences among these same - species shells represent variation at the individual level.

Answer:

that there is variation in the level of the individual