Fossil Evidence Suggests That the Latest Possible Date for Root

question 24

Short Answer

Fossil evidence suggests that the latest possible date for root of the universal phylogeny predates the ________ billion-year mark.

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Definitions:

Coarse Adjustment Knob

Part of a microscope used for making the initial, rough focusing of the lens on the specimen.

Coverslip

A thin piece of glass or plastic placed over specimens on a microscope slide, holding the specimen in place and providing a clear viewing surface.

Magnification

The process of enlarging the appearance of an object through optical instruments such as microscopes.

Immersion Oil

A type of oil used to increase the resolution of a microscope by minimizing refraction of light.