<font size="3"><strong>'''What is sequence (in biology)?</strong>'''</font> <br /><font size="3"><br />A&nbsp;sequence is an ordered list of objects. A sequence is a discrete function.&nbsp;<br />A sequence usually contains information.</font><br /><br />'''Wikipedia''': In&nbsp;[https://en.wikipedia.org/wiki/Mathematics mathematics], a&nbsp;'''sequence'''&nbsp;is an enumerated collection of objects in which repetitions are allowed and&nbsp;[https://en.wikipedia.org/wiki/Order_theory order]&nbsp;matters. Like a&nbsp;[https://en.wikipedia.org/wiki/Set_(mathematics) set], it contains&nbsp;[https://en.wikipedia.org/wiki/Element_(mathematics) members]&nbsp;(also called&nbsp;''elements'', or&nbsp;''terms''). The number of elements (possibly infinite) is called the&nbsp;''length''&nbsp;of the sequence. Unlike a set, the same elements can appear multiple times at different positions in a sequence, and unlike a set, the order does matter. Formally, a sequence can be defined as a&nbsp;[https://en.wikipedia.org/wiki/Function_(mathematics) function]&nbsp;whose domain is either the set of the&nbsp;[https://en.wikipedia.org/wiki/Natural_number natural numbers]&nbsp;(for infinite sequences), or the set of the first&nbsp;''n''&nbsp;natural numbers (for a sequence of finite length&nbsp;''n'').<br/font><br />&nbsp;