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Select the word or phrase from the Terms section that best matches the definition or example provided in the Definitions section.
-Earthen constructions by ancient American peoples, especially throughout the gigantic drainage of the Ohio and Mississippi rivers, after about 2500 B.P.; they were often used to bury important leaders and to enact major ceremonies.


Definitions:

Fiddler Crabs

A group of crab species known for their sexually dimorphic claws, where males have one very large claw used for communication and combat.

Heterozygote

An individual having two different alleles of a specific gene, resulting in genetic variation within a population.

Mutations

Changes in the DNA sequence of an organism's genome, which can lead to variations in physical appearance, behavior, or physiology.

Viruses

Microscopic infectious agents that replicate only inside the living cells of organisms, causing various diseases.

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