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Organelles such as the nucleus are not present in _________ organisms.
Observational Study
A study in which a researcher carefully and systematically observes and records behavior without interfering with the behavior; it may involve either naturalistic or laboratory observation.
Exploratory
Research designed to investigate an area or phenomenon that is not well understood, often used to generate hypotheses for further study.
Experimental
Pertaining to a method of research that tests a hypothesis under controlled conditions.
Double-blind
A study or clinical trial design in which neither the participants nor the experimenters know who is receiving a particular treatment, to prevent bias.
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