In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear.
In mathematics, a chain complex is an algebraic structure that consists of a sequence of abelian groups and a sequence of homomorphisms between consecutive groups such that the image of each homomorphism is included in the kernel of the next.
Complex were an English band formed in 1968 consisting of lead guitarist Brian Lee, lead vocalist and drummer Tony Shakespeare, bass guitarist Lance Fogg and rhythm guitarist Tony Fisher.
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