Scientists Continue to Debate the Relationship Between Two Homo Fossil

question 50

Multiple Choice

Scientists continue to debate the relationship between two Homo fossil finds: KNM-ER 1470, named H. rudolfensis by some, and KNM-ER 1813, generally considered to be an exemplar of H. habilis. Is the smaller KNM-ER 1813 a distinct species? Could it be a female version of KNM-ER 1470, both being simply a female and male pair of the highly variable H. habilis? The only sure conclusion is that

• A) there is a trend in hominin evolution toward large molars.
• B) females are poorly represented in the hominin fossil record.
• C) no hominin fossil younger than 2.5 m.y.a. has exhibited chimplike features.
• D) KNM-ER 1470 is more like an australopith than a Homo.
• E) several different kinds of hominin lived in Africa before and after the advent of Homo.

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Definitions:

Lone Pairs

Pairs of valence electrons on an atom that are not shared with another atom and do not participate in bonding.

Electron Density

A measure of the probability of electron presence at a specific location around the nucleus of an atom or within a molecule, often visualized in electron density maps.

Orbitals

Mathematical functions describing the regions of space around an atom where electrons are likely to be found.

Spherical Symmetry

A form of symmetry where an object appears the same from any point of view, characteristic of some molecules.