The glands that secrete hormones comprise the endocrine signaling system. The term hormone is sometimes extended to include chemicals produced by cells that affect the same cell (autocrine or intracrine signalling) or nearby cells (paracrine signalling).
A fen is one of the main types of wetland, the others being grassy marshes, forested swamps, and peaty bogs. Along with bogs, fens are a kind of mire. Fens are usually fed by mineral-rich surface water or groundwater.
Chard (Beta vulgaris subsp. vulgaris, Cicla-Group and Flavescens-Group) is a leafy green vegetable often used in Mediterranean cooking. In the Flavescens-Group-cultivars, the leaf stalks are large and are often prepared separately from the leaf blade.hard is a biennial. Clusters of chard seeds are usually sown, in the Northern Hemisphere, between April and August, depending on the desired harvesting period. Chard can be harvested while the leaves are young and tender, or after maturity when they are larger and have slightly tougher stems.