Biologists classify organisms based on physical characteristics and genetic relationships. Each specific kind of living thing is given a designated species name. Groups of related species are grouped together into a genus. Related genera are grouped into families, and families that show close relationships are grouped into orders. Orders are grouped into classes, classes into phyla or divisions, and phyla into kingdoms.
Kingdoms are the broadest level of classification of living creatures. Most biologists agree that organisms are divisible into six kingdoms, though earlier versions of the classification system rely on only five. The six kingdoms in the modern system are: Monera, which contains unicellular bacteria that lack nucleii, Archaea, which contains unicellular bacteria that feature nucleii, Protista, which contains unicellular organisms with plant-like or animal-like characteristics, Fungi, which contains multicellular organisms which absorb nutrients from an external source, Plantae, which consists of multicellular organisms that are capable of photosynthesis, and Animalia, which consists of multicellular organisms that obtain and break down complex nutrient molecules internally.
Each Kingdom is subdivided into Phyla, each Phylum into several classes, and so forth. The further down the classifications scheme, the more similar its members. Common Phyla in the Kingdom Animalia, for example, are Molluska, which contains shelled mollusks that live in water, and Nematoda, which contains several classes of thread-like roundworms.Learn More
My Science Box explains that Earth is a biosphere, as it is a global sum of all ecosystems. A biosphere is a closed system containing various zones of life. All living organisms within a biosphere are organized into various layers of complexity. These layers extend from the individual, to populations and communities, to ecosystems and biomes.Full Answer >
The densest material on earth was created by the Large Hadron Collider and named quark-gluon plasma. The substance can only exist in extremely hot temperatures and is denser than a neutron star.Full Answer >
Felsic, intermediate and mafic igneous rocks differ in their mineral composition. Felsic rocks are light in color and are composed of feldspars and silicates. Mafic rocks are darker and are composed of magnesium and iron. Intermediate rocks are composed of the minerals amphibole and feldspar and contain a combination of light and dark minerals.Full Answer >
An ice cap is a glacier that covers less than 19,000 square miles. These miniature ice sheets form in polar and subpolar regions that are high in elevation and possess a relatively flat surface. Glacial ice that covers an area greater than 19,000 miles is known as an ice sheet.Full Answer >