Which can be called a filler tissue?

Parenchyma: Parenchyma is a type of simple plant tissue that is made up of thin-walled cells. It is found in many different parts of the plant, including leaves, stems, and roots. Parenchyma cells are primarily responsible for photosynthesis, storage, and other metabolic functions. They can also fill spaces between other plant tissues.

Collenchyma: Collenchyma is another type of simple plant tissue that is made up of elongated cells with thickened cell walls. It is often found in the outer layers of stems and leaves, where it provides structural support and helps fill spaces between other plant tissues.

Sclerenchyma: Sclerenchyma is a complex plant tissue that is made up of thick-walled cells with lignified secondary cell walls. It provides mechanical support to the plant and helps fill spaces between other plant tissues.