The Types of Living Organisms on Earth Have Changed Over

question 47

Multiple Choice

The types of living organisms on Earth have changed over time-new species have originated and existing species have disappeared.This is an example of

• A)speciation.
• B)extinction.
• C)macroevolution.
• D)alternation of generations.
• E)hybridization.

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Definitions:

Toluene

A colorless, water-insoluble liquid hydrocarbon with a sweet smell, used as an industrial solvent and in the production of benzene.

Stereogenic Center

An atom in a molecule, often carbon, that is connected to four different groups, giving rise to stereoisomers due to the spatial arrangement of these groups.

Stereoisomer

Molecules that have the same molecular formula and sequence of bonded atoms but differ in the three-dimensional orientations of their atoms in space.