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arealhero arealhero
wrote...
Posts: 7874
9 years ago
In a model experiment, researchers subjected frogs to various levels of atrazine while keeping all other variables constant. This is an example of a _______ experiment.
a. controlled
b. repeated
c. laboratory
d. comparative
e. None of the above
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milestone23milestone23
wrote...
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Posts: 9919
9 years ago
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arealhero Author
wrote...
9 years ago
This is perfect, thank you for the answer.
wrote...
9 years ago
Great!
Retired master
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