The slime moulds and multicellular algae are presently included in the kingdom protista because

Options

A. they appear to be more closely related to uniceliular eukaryotes
B. they lack important characteristics of the fungi and plants
C. kingdom protista includes eukyotic organisms that do not clearly belong in the other three kingdoms
D. All of the aabove

Answer

**Step-by-Step Solution:**

1. **Understanding Kingdom Protista**: The kingdom Protista is a diverse group of eukaryotic microorganisms that do not fit into the other three kingdoms (Animalia, Plantae, and Fungi). This kingdom includes organisms that are primarily unicellular but also includes some multicellular forms.

2. **Characteristics of Slime Moulds**: Slime moulds were previously classified under fungi due to their similar characteristics. However, they exhibit unusual morphology and have a different cell wall composition. Unlike fungi, which have chitin in their cell walls, slime moulds have cellulose.

3. **Characteristics of Multicellular Algae**: Multicellular algae are often referred to as plant-like protista. They are not true plants but share some similarities with them. However, they do not possess all the defining characteristics of plants, which is why they are classified under Protista.

4. **Eukaryotic Nature**: Both slime moulds and multicellular algae are eukaryotic organisms. This means they have complex cells with a nucleus and other organelles, distinguishing them from prokaryotic organisms.

5. **Lack of Defining Characteristics**: Slime moulds and multicellular algae lack the key characteristics that define the other kingdoms. They do not fit neatly into the categories of plants, animals, or fungi, which is why they are included in the kingdom Protista.

6. **Conclusion**: The slime moulds and multicellular algae are included in the kingdom Protista because they exhibit characteristics that do not clearly align with the other three kingdoms. They are eukaryotic and share some features with unicellular eukaryotes, making them distinct and suitable for classification under Protista.

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