what sort of cells do not have a cell wall around them ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Cell Walls**: Begin by identifying what a cell wall is. A cell wall is a rigid outer layer that provides structure and protection to certain types of cells, primarily found in plants, fungi, and some bacteria.

2. **Identifying Cells Without Cell Walls**: Next, consider which types of cells do not have a cell wall. The primary type of cells that lack a cell wall are animal cells.

3. **Structure of Animal Cells**: Animal cells are surrounded by a cell membrane instead of a cell wall. The cell membrane is flexible and allows for various functions, including protection and transport of substances in and out of the cell.

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