Questions: A distinguishing characteristic of red algae is that they lack and

The distinguishing characteristic of red algae is that they lack flagella and centrioles.

Explanation:

• Red algae, belonging to the phylum Rhodophyta, are unique among algae because they do not have flagella at any stage of their life cycle. Flagella are whip-like structures that aid in cell movement, and their absence in red algae is a notable feature.
• Additionally, red algae lack centrioles, which are involved in cell division in many other eukaryotic organisms. This absence is another distinguishing characteristic of red algae.

In summary, red algae are characterized by the absence of both flagella and centrioles.