4. what are some reasons why you might want to use a genetically correlated trait instead of the trait you are truly interested in (e. g., the economically relevant trait)?

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

the real answer is b. scintillation counter

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