By Dr Ananya Mandal, MD. Dopamine is a neurotransmitter released by the brain that plays a number of roles in humans and other animals. Some of its notable functions are in: 1  movement. 2  memory. 3  pleasurable reward.
Sycamores (Platanus spp.) are tall, spreading shade trees. These North American natives have few problems or pests, but their older bark flakes off in patches. If your sycamore is shedding bark, it may be a healthy, maturing tree.
White birch is easy to identify with its distinctive, white, papery bark. The sycamore tree also has white bark, but it does not sluff off in thin, paper-like furls like the white birch. The sycamore also has large hand-shaped leaves versus the white birchâs smaller, oval-shaped leaves with a pointed tip. The birch leaf is also irregularly toothed.