The camel is able to adapt easily in a desert environment primarily due to its hump, which stores food as fats. This adaptation helps the camel survive in the harsh desert conditions, where food and water resources may be scarce. The hump allows the camel to store energy in the form of fat, which it can utilize when food is not readily available. This adaptation helps the camel withstand long periods of time without eating.

Option 2, water cells in the stomach to store metabolic water, is not a correct adaptation of camels. While it is true that camels are able to obtain water from the metabolic breakdown of fats in their hump, this water is not stored in cells in their stomach.

Option 3, nucleated Red Blood Cells, is also not a correct adaptation of camels. Nucleated red blood cells are found in the blood of animals such as reptiles, birds, and some fish, but not in camels.

Option 4, hair growth near the eyes and nostrils, is not directly related to the camel`s adaptation to the desert environment. Hair growth in these areas helps to protect the camel`s eyes and respiratory passages from sand and dust, but it is not the main reason for their ability to adapt to the desert.