In poetry, a stanza is a division of four or more lines having a fixed length, meter or rhyming scheme. Stanzas in poetry are similar to paragraphs in prose. Both stanzas and paragraphs include connected thoughts and are set off by a space. The number of lines varies in different kinds of stanzas but it is uncommon for a stanza to have more than twelve lines. The pattern of a stanza is determined by the number of feet in each line and by its metrical or rhyming scheme.
BIOLOGICAL TOXINS. Toxins are defined as any toxic substance of natural origin produced by an animal, plant, or microbe. They are different from chemical agents such as VX, cyanide, or mustard in that they are not man-made.
1 Alkaloids are produced by a large variety of organisms, including bacteria, fungi, plants, and animals, and are part of the group of natural products (also called secondary metabolites). 2  Many alkaloids can be purified from crude extracts by acid-base extraction.3  Many alkaloids are toxic to other organisms.harmacognosy is the study of medicinal drugs derived from plants or other natural sources.