Questions: Some protists form long, foot-like projections of their cell membrane and cytoplasm that are used for movement and to capture food. What is the name of these structures? cilia flagella mycelia pseudopods

The answer is the fourth one: pseudopods.

Explanation for each option:

1. Cilia: These are short, hair-like structures that protrude from the surface of some eukaryotic cells. They are used for movement and to move fluid over the cell's surface, but they are not long, foot-like projections.

2. Flagella: These are long, whip-like structures used for movement in some cells, such as sperm cells or certain bacteria. While they are used for movement, they are not foot-like projections.

3. Mycelia: This term refers to the network of fungal threads or hyphae. It is not related to protists or their movement structures.

4. Pseudopods: These are temporary, foot-like extensions of the cell membrane and cytoplasm used by some protists, like amoebas, for movement and capturing food. This matches the description given in the question.

In summary, the structures described in the question are pseudopods, which are used by some protists for movement and feeding.