Answer :
The best and most correct answer among the choices provided by your question is the fourth choice or letter D.
The type of sampling method the biologist used was a stratified random sampling.
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The type of sampling method the biologist used was a stratified random sampling.
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!