Therefore, the laws of similarity have to be sought between problems described by the same physics. Definition of physical similarity as a general proposition. Two systems, described by the same physics, operating under different sets of conditions are said to be physically similar in respect of certain specified physical quantities; when the ratio of corresponding magnitudes of these quantities between the two systems is the same everywhere.
It forms the basic building blocks of the study of nature, and is a key science on which many others depend.
Taxonomists classify all organisms into a hierarchy, and give them standardised names, that are often Latin or Greek, or derived from other languages and even people's names. These specialised groups are collectively called the classification of living things. There are seven main levels of classification in the hierarchy. They are, from the most to the least inclusive:. Living things are placed into certain kingdoms based on how they obtain their food, the types of cells that make up their body, and the number of cells they contain.
Phylum is the next level following kingdom in the classification of living things. It is an attempt to find physical similarities among organisms within a kingdom.
These physical similarities suggest that there is a common ancestry among those organisms in a particular phylum. Classes are way to further divide organisms of a phylum.
Organisms of a class have even more in common than those in an entire phylum. Order Organisms in each class are further broken down into orders. Gov't, Non-P. Research Support, U. Gov't, P. Oxford Reference. Publications Pages Publications Pages. Recently viewed 0 Save Search. A Dictionary of Mechanical Engineering 1 ed. Find at OUP. Read More. Your current browser may not support copying via this button. Subscriber sign in You could not be signed in, please check and try again.
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