The calorie expenditure for road cycling and mountain biking can vary based on factors such as intensity, terrain, and duration. Generally, road cycling on flat terrain at a moderate pace can burn around 400-600 calories per hour, while mountain biking on varied terrain with hills and obstacles can burn around 500-800 calories per hour. The higher calorie expenditure in mountain biking is due to the increased effort required to navigate the challenging terrain and obstacles. Overall, mountain biking tends to result in a higher calorie expenditure compared to road cycling. **

Yellow fingernails can be caused by a variety of factors, including smoking, fungal infections, certain medical conditions, or using nail polish for extended periods of time. It is important to consult with a healthcare professional to determine the underlying cause and receive appropriate treatment. In the meantime, practicing good nail hygiene, avoiding smoking, and keeping nails clean and dry can help prevent further discoloration. **

Yes, fingernails can develop mold if they are exposed to a warm and moist environment for an extended period of time. This can happen if the nails are not kept clean and dry, or if they come into contact with mold spores. To prevent mold growth on fingernails, it is important to practice good hygiene, keep the nails trimmed, and ensure they are thoroughly dried after washing. **

Whether or not you should stop mountain biking depends on your personal circumstances and reasons for considering stopping. If you are experiencing physical pain or injury from mountain biking, it may be wise to take a break and seek medical advice. If you are feeling burnt out or no longer enjoying the activity, it may be beneficial to explore other forms of exercise or outdoor activities. Ultimately, the decision to stop mountain biking should be based on your own well-being and enjoyment. **

Fingernails do not contain DNA themselves, as they are made up of a protein called keratin. However, the cells at the base of the fingernail, known as the nail matrix, do contain DNA. These cells are responsible for producing new nail cells, which then harden and form the visible part of the fingernail. Therefore, if DNA is needed for identification purposes, the cells at the base of the fingernail would be the best source for obtaining it. **

Opinions on chewed fingernails being disgusting can vary from person to person. Some may find it unhygienic and off-putting, while others may not be bothered by it. Ultimately, it depends on personal preferences and cultural norms. It is important to practice good nail hygiene to prevent potential health risks associated with nail biting. **

Fingernails harden due to the protein called keratin, which is a key component of nails, hair, and skin. As new nail cells grow, they push older cells towards the tips of the fingers, where they harden and eventually form the visible nail plate. The keratin in these older cells undergoes a process of cross-linking, which strengthens and hardens the nail. Factors such as diet, hydration, and overall health can also impact the hardness and strength of fingernails. **

Transparent fingernails are nails that are see-through or semi-transparent, allowing the natural color of the nail bed to show through. This can occur due to a variety of reasons, such as malnutrition, certain medical conditions, or aging. Transparent fingernails may also be a sign of underlying health issues, so it's important to consult a healthcare professional if you notice this change in your nails. **