Some plants, such as sunflowers, have a flower part that moves to face the sun. What is the most likely reason for this adaptation?

It allows the leaves and the flower to grow symmetrically.

It allows the plant to absorb as much sunlight as possible.

It allows the plant to protect itself from animals.

It allows the plant to speed up the process of photosynthesis.

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect