This precursor of bone is found in all vertebrate embryos and makes up the skeletons of sharks and lampreys. Coprinus - The Coprinus genus of mushrooms consists of about 100 species from around the world. Daphnia - Daphnia are microscopic crustaceans that populate lakes and ponds throughout the world. One of the most prolific sea organisms, the nearly 16,000 species of this group form a significant portion of the aquatic food chain. Dust - Household dust contains a variety of tiny particles including hair, skin flakes, pollen, mold, clothing fibers, animal dander, and detergents.
Dust is a common cause of allergies, but it's actually the dust mites that are the culprits.
Elodea Leaf - Elodea, the once innocent aquarium plant, has become infamous as an invasive species in many parts of the world. Unwanted plants have been dumped into lakes and ponds where they form dense mats that choke out native aquatic plants, provide poor habitat for fish, and interfere with aquatic sports. Green Algae - One of the most diverse and widespread group of algae, these aquatic plants are found all over the world where they produce an estimated 30 to 50 percent of the total global oxygen. Lily Flower Bud - The lily flower, a herbaceous flowering plant native to the temperate areas of the Northern Hemisphere, figures prominently as a symbol in mythology, folklore, and contemporary culture. Liverworts don't contribute directly to the human economy, but do provide food for animals, facilitate the decay of fallen trees, and help disintegrate rocks.