In decay schemes of this type, the following three conditions may predominate: (1) secular equilibrium, (2) transient equilibrium, and (3) the state of no equilibrium.

The Goniatitida were characterised by a smooth, undulated or bended suture ('goniatitic'), whereas the Ceratitida possessed sutures that were posteriorly zig-zagging but anteriorly smooth ('ceratitic').

The spermatozoon is not concerned with evasion, but in addition to the ordinary physical and chemical changes it has a special attractional relation to the ovum.

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