A mold is formed when a deceased animal is buried by sediment from the Earth. As the animal starts to decay, a chamber remains in the shape of the animal. A fossil cast is made when minerals are deposited in the mold.Continue Reading
There are two types of molds created by a fossil: external and internal. The external mold is made when the organic materials on the creature decay, leaving behind an imprint of the external shape and characteristics of the animal. And internal mold is created when a hollow organism fills with sediment and minerals after it dies. As the shell decays, an imprint of the organism is left in the minerals that creates the fossil.
Though casts can be made through natural processes, many of them are made though artificial means. Students and researchers create a mixture using clay and plaster of paris to cover the fossil. The concoction is allowed to dry before being removed. This creates an exact replica of the fossil that is more durable than the original, allowing for it to be handled and studied without compromising the original artifact. These synthetic casts can be made using both external and internal molds of the fossil.Learn more about Biology
Amoebae, slime mold, algae and protactists are some examples of unicellular organisms. Unicellular organisms fall under the main groups of bacteria, archaea, protozoa, single-celled algae and single-celled fungi. The two general categories are prokaryotes, which lack membrane-bound nuclei and membrane-bound organelles, such as mitochondria; and eukaryotes, which are more complex, having membrane-bound organelles and nuclei.Full Answer >
Most commonly found outdoors in garden areas and flower beds, yellow slime mold is a fungus that thrives in mulch and thick grass clippings. Resembling the regurgitated contents of a dog's stomach, the unsavory mold has no plant or animal classification. It is a primitive, single-celled organism.Full Answer >
Some examples of fungi classified within the group Zygomycota are black bread mold and Rhizopus oligosporus, which is used to produce tempeh. Zygomycetes are a group of mostly microscopic fungi that differ from other fungi in that they reproduce using zygospores.Full Answer >
Temperature can either inhibit or encourage the growth of fungi like mold. Most common molds cannot grow at or below 39 degrees Fahrenheit, which is why it is recommended to keep freezers and other refrigeration equipment at this temperature or lower as needed. Higher temperatures can encourage mold growth, especially on food items or moist surfaces, which high temperatures can cause due to condensation.Full Answer >