Consider a Phylogenetic Tree

question 109

Multiple Choice

Consider a phylogenetic tree. The node at the bottom of the tree (i.e., the "root") would represent which of the following?

• A)the common ancestor of all organisms included in the tree
• B)the common ancestor of a subset of the organisms included in the tree
• C)an organism that is unrelated to all other organisms included in the tree
• D)an organism that is the common ancestor for organisms not included in the tree
• E)Nothing; the node serves only as the starting point of the tree.

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Definitions:

Oil Shale

A sedimentary rock containing organic materials that can be processed to produce shale oil.

Electricity

A form of energy resulting from the existence of charged particles which can be statically held or dynamically flowing through conductors.

Coal

A combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams, used as a fossil fuel for producing electricity and heat.