1. Lacking elasticity; unyielding or unadaptable. See Synonyms at stiff. 2. Economics Of, relating to, or being a good for which changes in price have little effect on the quantity demanded or supplied: the inelastic demand for cigarettes.
The classification of algae is complex and somewhat controversial, especially concerning. the blue-green algae (Cyanobacteria), which are sometimes known as blue-green. bacteria or Cyanophyta and sometimes included in the Chlorophyta. These topics are. not covered in detail this document.
Algae are photosynthetic eukaryotic organisms. Waters contain a huge variety of algae including golden, yellow, brown, red, green, and yellow-green algae as well as diatoms. Algae can be microscopic or macroscopic, in which case they are known as kelp.