______ Refer to Several Periods in U

question 5

Multiple Choice

______ refer to several periods in U.S.history when perceived threats from anarchist,communist,and other leftist subversives created a generalized climate of political anxiety.

• A)Sedition Eras
• B)Homeland Strikes
• C)Red Scares
• D)Alien Acts

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Definitions:

Own Species

The specific group of organisms to which an individual belongs, identifying it from others in terms of genetics and morphology.

Million Years Ago

A unit of time used in geology and paleontology to denote periods that are millions of years in the past from the present day.

Stromatolites

Layered bio-chemical structures formed in shallow water by the trapping, binding, and cementation of sedimentary grains by microorganisms, mainly cyanobacteria.

Mineralized Layers

Layers or deposits of organic or inorganic material that have been transformed into a solid, mineral-like substance over time.