Aphysiologist incubates eggs in the lab at a range of temperatures to see what temperatures produce males and what temperatures produce females. this experiment is hypothesis-driven and
manipulative or observational

The correct answer will be- manipulative experiment

Explanation:

A manipulative experiment is an experiment in which the researcher modifies and manipulate the system to uncover the causal relationship.

The manipulative experiment is performed when the researcher is familiar with the hypothesis and on the basis of which the researcher can modify the confounding variables so as to eliminate the error in results.

In the given question, the physiologist studied the temperature range to see the range at which males and females will be produced which could be considered a manipulative experiment as the experiment will be performed in the lab by modifying the confounding variables.

Thus, a manipulative experiment is the correct answer.