Evolution refers to descent with modification: the concept that organisms have changed and modified their morphology (morph - shape; ology - the study of) through each succeeding generation (see Appendix 3.1 for a brief refresher on evolution). That makes each new generation the most recent bearer of the unbroken genetic thread that connects life. Each new generation is forward-looking in that its members potentially contain new features that might be useful for whatever the organism encounters in its life; but it is also connected to its past (its ancestors) by features that it has inherited. That connection is relationship.

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