Which algal group contains individuals that are typically unicellular and form siliceous shells?

A) Diatoms
B) Red algae
C) Brown algae
D) Green algae
E) Dinoflagellates

Siliceous Shells

Shells or skeletons of some aquatic organisms, made of silica and found in diatoms and certain sponges.

Diatoms

A major group of algae, specifically microalgae, known for their unique silica-based cell walls, which exhibit intricate and beautiful designs.

Unicellular

Composed of a single cell, characteristic of organisms that perform all life processes within a single cellular structure.