Modifies a noun

• alga: Grazing activated chemical defense in a unicellular marine alga.

• algae: These are unicellular algae characterized by the silicified cell made by two halves.

• organism: We then move out and look at the whole cell and unicellular organisms such as bacteria which have dramatic effects on our lives.

• animal: Mainly plants and unicellular animals reigned until 30,000 years ago, when dinosaurs and humanity appeared.

• plant: Yeast - a simple, unicellular, microscopic plant that causes the fermentation of sugars to alcohol and carbon dioxide.

• eukaryotes: Examples will be taken from a group generally regarded as " difficult " , the unicellular eukaryotes.