WHAT IF? In several different animal lineages, organisms with a head first appeared around 530 million yearsago. Does this finding constitute proof that having ahead is favored by natural selection? Explain

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A: The change in trait in organisms over a period of time is known as evolution.

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Q: e elephants evolving

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Evolutionary lineages

An evolutionary lineage is a series of populations of organisms that descend from a common ancestor. Each species in the lineage is the direct consequence of evolutionary change from a common ancestor. A phylogenetic tree is generally used to display lineages visually. Lineages are components of the phylogenetic tree of life. Molecular systematics procedures are widely used to predict lineages.