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.Know More
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 about Earth Science
Every substance has both physical characteristics, such as color and luster, as well as chemical properties, such as flammability and reactivity. Physical characteristic or physical properties are those that are easily observed without changing the substance chemically. Chemical properties represent a substance's ability to undergo chemical changes and are observable only when these changes take place.Full Answer >
Greek philosopher Aristotle created two classification systems to group living organisms based on several factors, including physical characteristics and perceived mental capacities. Aristotle organized living organisms physically on the basis of movement as well, which included walking, flying and swimming and in intellectual hierarchy through the Great Chain of Being, also called scala naturae. Aristotle introduced his systems of scientific classification in the 1600s, which classified organisms until the 1800s.Full Answer >
Chromatography is used to study plant pigment by extracting pigments from the plant and then sorting them by their physical characteristics so they can be analyzed. Chromatography is useful in separating different types of plant pigments because they are very similar to one another and can be difficult to distinguish or physically separate otherwise.Full Answer >
Squids and octopuses are both head-footed cephalopods, but their behavior, habitat and physical characteristics are different. Both are blue-blooded aquatic animals, as their blood contains copper and has oxygen-carrying molecules, and they both move by jet propulsion and live in salty waters in temperate zones. They both squirt ink, but it's different colors. Squids produce blue-black ink while octopuses squirt black ink.Full Answer >