**Explanation:**

**Introduction:**
Ostrich eggs are the largest eggs produced by any living bird species. They are laid by female ostriches, which are flightless birds native to Africa. Ostrich eggs are known for their large size and unique characteristics.

**Visual Appearance:**
Ostrich eggs are indeed visible to the naked eye due to their size. They are about 15-18 centimeters in length and weigh around 1.4 kilograms on average. This makes them the largest eggs produced by any bird species. The size of an ostrich egg is approximately equal to 24 chicken eggs.

**Shell Structure:**
The shell of an ostrich egg is extremely thick and sturdy. It is composed of multiple layers, including a hard outer layer and a porous inner layer. The outer layer protects the egg from external damage, while the inner layer allows for gas exchange during incubation.

**Cellular Composition:**
Like all eggs, an ostrich egg contains cells within it. However, it is important to note that the cells present in an ostrich egg are not visible to the naked eye. The cells are microscopic in size and require magnification, such as a microscope, to be seen.

**Misinterpretation:**
The question seems to imply that the ostrich egg itself is a single cell visible to the naked eye. However, this is a misinterpretation. The ostrich egg is a structure produced by the female ostrich's reproductive system, which contains multiple cells within it. These cells are not individually visible without the aid of magnification.

**Conclusion:**
In conclusion, the statement that an ostrich egg is a cell visible to the naked eye is false. While the egg itself is visible due to its large size, it is composed of multiple cells that are not individually visible without magnification. Ostrich eggs are fascinating structures worth studying, but their cellular composition requires the use of scientific tools to observe at a microscopic level.

Ostrich egg is the biggest cell and thus can be seen by naked eyes.Hope it helps :)!!!