"Golden algae" is the common name for algae that belong to ............ .

Statement $X$: Presence of a rigid cell wall and nucleoprotein as genetic material.
Statement $Y$: Examples include $Euglena$,$Dinoflagellates$,$Amoeba$,and $Paramecium$.

$S -$ Statement: Paramecium is a ciliate.
$R -$ Reason: Euglena is a flagellate.

The posterior end of $Amoeba$ is characterized by:

The cell wall of diatoms is composed of .........

Which kingdom includes both unicellular and multicellular eukaryotic organisms?