As in other mammals, thermoregulation is an important aspect of human homeostasis. Most body heat is generated in the deep organs, especially the liver, brain, and heart, and in contraction of skeletal muscles. Humans have been able to adapt to a great diversity of climates, including hot humid and hot arid.
Japanese knotweed is a perennial weed, producing tall canes, up to 2.1m (7ft) in height during the summer. The canes have characteristic purple flecks, and produce branches from nodes along its length. These branches support shovel-shaped leaves.
Japanese magnolia is a large shrub or small tree notable for its textured gray bark, long fuzzy buds and waxy, six-petaled, goblet-shaped flowers. Flowers are available in a spectrum of colors, from magenta to pale ballet pink, purple or white. Japanese magnolia is fairly low-maintenance when planted in the right cultural conditions.