Cells from which of the following organisms would be expected to contain cell walls?

Cell walls are an important structural component found in certain organisms that provide rigidity and protection. In plants, the cell wall is primarily made of cellulose, a carbohydrate that gives the plant its strength and helps it maintain shape.

Water lilies belong to the plant kingdom, and like all plants, they are characterized by the presence of a cell wall. This cell wall not only supports the plant's structure but also plays a role in regulating water and nutrient absorption.

In contrast, animals, such as dogs and humans, are composed of cells that lack a cell wall. Instead, animal cells are surrounded by a flexible plasma membrane, allowing for greater flexibility and a range of cell shapes and functions necessary for complex organisms.

Bacteria can also have a cell wall, but its composition differs significantly from that of plants. Bacterial cell walls are primarily made of peptidoglycan, which provides structural support and protection against environmental stress.

Ultimately, the presence of a cell wall is a defining characteristic of plant cells, including those of water lilies, making them the correct answer in this scenario.