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In humans, the vermiform appendix is sometimes called a vestigial structure as it has lost much of its ancestral digestive function.. Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. [1]
Arrows show the vestigial structure called Darwin's tubercle. In the context of human evolution, vestigiality involves those traits occurring in humans that have lost all or most of their original function through evolution. Although structures called vestigial often appear functionless, they may retain lesser functions or develop minor new ones.
A sentence diagram is a pictorial representation of the grammatical structure of a sentence. The term "sentence diagram" is used more when teaching written language, where sentences are diagrammed. The model shows the relations between words and the nature of sentence structure and can be used as a tool to help recognize which potential ...
The question of whether or not the contraction of Arrectores pilorum, when a human is cold, is an efficient thermoregulatory mechanism in particularly hairy humans is irrelevant to the question of whether or not the mechanism is vestigial in an overall sense. There is no contention that their contraction, when cold, is has no significant ...
The clause structure with an inverted subject and verb, used to form questions as described above, is also used in certain types of declarative sentences. This occurs mainly when the sentence begins with adverbial or other phrases that are essentially negative or contain words such as only , hardly , etc.:
The question of whether or not the contraction of Arrectores pilorum, when a human is cold, is an efficient thermoregulatory mechanism in particularly hairy humans is irrelevant to the question of whether or not the mechanism is vestigial in an overall sense. There is no contention that their contraction, when cold, is has no significant ...
A simple sentence consists of only one clause. A compound sentence consists of two or more independent clauses. A complex sentence has at least one independent clause plus at least one dependent clause. [1] A set of words with no independent clause may be an incomplete sentence, also called a sentence fragment.
Such is the case in whales, which have small vestigial bones that appear to be remnants of the leg bones of their ancestors which walked on land. [53] Humans also have vestigial structures, including the ear muscles, the wisdom teeth, the appendix, the tail bone, body hair (including goose bumps), and the semilunar fold in the corner of the eye ...