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.

An average maturing tree under optimal conditions can transport up to 10,000 gallons of water only to capture about 1,000 usable gallons for the production of food and adding to its biomass.

Restaurant trends may come and go, but the backbone of San Francisco is its classic restaurants. The best of the best are transportive, reminding San Franciscans and tourists alike of what makes ...