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All tree leaves have an outer layer called the epidermis, which can also be used in the identification process. This leaf "skin" always has a waxy cover called the cuticle and varies in thickness.

There are 49 species of pine tree native to North America. Non-native species have also been introduced to the United Sates, as ornamental trees in landscaping.

Neurodegeneration refers to the progressive atrophy and loss of function of neurons, which is present in neurodegenerative diseases such as Alzheimer's disease and Parkinson's disease. This study ...

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Respiratory tract diseases are illnesses that affect components of the respiratory system, including the nasal passages, the bronchi and the lungs. They range from acute infections, such as ...