Meaning: 'Irresistible' means something that is too attractive or appealing to be resisted, suggesting that the smell is very effective in drawing insects.

Wrong options:

• great: While 'great' can describe something positive, it does not convey the specific allure needed in this context.
• foul: 'Foul' has a negative connotation, suggesting an unpleasant smell, which contradicts the idea of attracting insects.
• ingestive: 'Ingestive' relates to consumption and does not appropriately describe a smell, making it irrelevant in this context.

Correct answer: colleagues

Explanation: The term 'colleagues' is appropriate as it refers to individuals who work together in a professional setting, which fits the context of Beverley Glover's work at the university. It is grammatically correct and contextually relevant.

Meaning: 'Colleagues' means people who work together, especially in a professional environment, indicating a collaborative relationship.

Wrong options:

• friends: 'Friends' implies a personal relationship rather than a professional one, which does not fit the academic context.
• mates: 'Mates' is more informal and typically used in casual contexts, making it less suitable for a formal academic setting.
• known: 'Known' is an adjective and does not fit grammatically as a noun to describe people working with Beverley Glover.

Correct answer: origins

Explanation: The word 'origins' fits grammatically as it refers to the source or starting point of the bumblebees, which is relevant in the context of the experiment. It aligns with the idea of freeing bees from their natural habitat.

Meaning: 'Origins' refers to the beginnings or sources of something, in this case, the natural habitat of the bumblebees.

Wrong options:

• break: 'Break' does not fit contextually as it refers to a physical action rather than a state of being or location.
• possession: 'Possession' implies ownership, which does not relate to the natural state of the bumblebees in this context.
• revert: 'Revert' suggests returning to a previous state, which does not apply to the context of freeing bees.

Correct answer: results

Explanation: The word 'results' is appropriate as it refers to the outcomes of the experiment, fitting grammatically and contextually within the sentence. It indicates the findings from their research.

Meaning: 'Results' means the outcomes or findings from an experiment or study, highlighting what was discovered during the research.

Wrong options:

• aspects: 'Aspects' refers to different parts or features, which does not convey the idea of outcomes from the experiment.
• impacts: 'Impacts' suggests effects or influences, which is not the same as the specific findings of the experiment.
• suspects: 'Suspects' refers to individuals believed to be involved in wrongdoing, which is irrelevant in the context of scientific results.