Option 1 states that animal cells have only a cell membrane and no cell wall, while plant cells have only a cell wall and no cell membrane.

Option 2 states that animal cells have only a cell membrane and no cell wall, but plant cells have both a cell membrane and a cell wall.

Option 3 states that both animal and plant cells have both a cell membrane and a cell wall.

Option 4 states that only some cells of animals have a cell wall, while all plant cells have a cell membrane.

The correct answer is Option 2. Animal cells do not have a cell wall, but they do have a cell membrane. In contrast, plant cells have both a cell membrane and a cell wall.

Option 1 is incorrect because it suggests that animal cells have neither a cell membrane nor a cell wall, which is not true.

Option 3 is incorrect because it suggests that both animal and plant cells have a cell wall, which is not true for animal cells.

Option 4 is incorrect because it suggests that only some animal cells have a cell wall, which is not true. All animal cells lack a cell wall.