single common ancestor (a polyphyletic group). Most radially symmetric animals are symmetrical about an axis extending from the center of the oral surface...

is symmetric if it can be divided into two or more identical pieces that are arranged in an organized fashion. This means that an object is symmetric if...

Bilateria, a highly proliferative clade whose members have a bilaterally symmetric and significantly cephalised body plan, and the vast majority of bilaterians...

In biology, a phylum (/ˈfaɪləm/; pl.: phyla) is a level of classification or taxonomic rank below kingdom and above class. Traditionally, in botany the...

of a topological space Ring of symmetric functions#Specializations, an algebra homomorphism from the ring of symmetric functions to a commutative algebra...

carnivores and small mammals. Apparent competition can be symmetric or asymmetric. Symmetric apparent competition negatively impacts both species equally...

Aristotle's biology is the theory of biology, grounded in systematic observation and collection of data, mainly zoological, embodied in Aristotle's books...

are pore-forming proteins. The inner plasma membrane is also generally symmetric whereas the outer membrane is asymmetric because of proteins such as the...

appear to die of old age, or to age at all. Hydra has a tubular, radially symmetric body up to 10 mm (0.39 in) long when extended, secured by a simple adhesive...

and death in an organism that reproduces by morphologically symmetric division". PLOS Biology. 3 (2): e45. doi:10.1371/journal.pbio.0030045. PMC 546039...

neighboring sites of the lattice, forming a lattice path. In a simple symmetric random walk on a locally finite lattice, the probabilities of the location...

also provides several examples of handedness in traits that are usually symmetric. The following are examples of animals with obvious left-right asymmetries:...

x. PMC 1571085. PMID 12713266. Scott, T. (1996). Concise encyclopedia biology. De Gruyter. p. 542. ISBN 978-3-11-010661-9. Brazeau, Martin D.; Castiello...

1], but are not necessarily equal. This measure is not symmetric. If one desires a symmetric measure they can consider the following redundancy measure:...

(NPCs) perforating the envelope.: 650  Each NPC contains an eightfold-symmetric ring-shaped structure at a position where the inner and outer membranes...

body cavity, a coelom or pseudocoelom. Animals with this bilaterally symmetric body plan have a head (anterior) end and a tail (posterior) end as well...

invagination of the original gastrula stage he saw as bilaterally symmetric rather than radially symmetric. The phagocytella hypothesis was proposed by Élie Metchnikoff...

cellular and molecular biology is a list of definitions of terms and concepts commonly used in the study of cell biology, molecular biology, and related disciplines...

In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is a process...

historical taxonomic rank that was used to classify animals with radially symmetric body plans. The term Radiata is no longer accepted, as it united several...

Ramawat, Jean-Michel Merillon and K. R. Shivanna (Editors) Reproductive Biology of Plants (2016), p. 70, at Google Books Wikimedia Commons has media related...

varies: complete symmetric - all individuals receive the same amount of resources, irrespective of their size perfect size symmetric - all individuals...

the axis (or plane) gives rise to a stereoisomer. For instance, the C2-symmetric species 1,1′-bi-2-naphthol (BINOL) and 1,3-dichloroallene have stereogenic...

(not necessarily actinomorphic) flowers arranged into a roughly radially symmetric inflorescence of the form known as a head, capitulum, or pseudanthium...

the final stages of cytokinesis, a process called abscission. During symmetric abscission, the midbody is severed at each end and released into the cellular...

057,594,037,927,936 different possible keys in the obsolete 56-bit DES symmetric cipher. Science Fiction: There are approximately 100,000,000,000,000,000...

Metamorphosis". Current Biology. 21 (18): R726–R737. Bibcode:2011CBio...21.R726L. doi:10.1016/j.cub.2011.07.030. PMID 21959163. Mader, Sylvia, Biology 9th ed. Ch....

rotationally symmetric saltire. The multiplication sign × is similar to a lowercase X (x) which is not a four-fold rotationally symmetric saltire. The...

example of reciprocal adaptation in bats is stealth echolocation. A more symmetric arms race may occur when the prey are dangerous, having spines, quills...

structure of P4O6 is like that of P4O10 without the terminal oxide groups. Symmetric phosphorus(III) trithioesters (e.g. P(SMe)3) can be produced from the...