Meaning: 'Tracks' means to monitor or follow the progress or movement of something, in this case, the activity levels of cows.

Wrong options:

• stabilizes: The verb 'stabilizes' implies making something steady or stable, which does not accurately describe the function of monitoring activity levels.
• polls: The verb 'polls' suggests gathering opinions or data from a group, which is not relevant to the context of monitoring animal activity.
• overwhelms: The verb 'overwhelms' means to overpower or inundate, which is not applicable in the context of tracking activity.

Correct answer: issues

Explanation: The verb 'issues' is appropriate here as it indicates the action of providing or distributing reminders, fitting grammatically with the subject 'app' in the present tense. Contextually, it makes sense as the app is designed to send out reminders for important protocols.

Meaning: 'Issues' means to provide or distribute something, such as reminders or notifications, to users.

Wrong options:

• argues: The verb 'argues' implies presenting a case or reasoning, which does not fit the context of sending reminders.
• imbues: The verb 'imbues' means to inspire or permeate with a feeling or quality, which is not relevant to the action of sending reminders.
• retrieves: The verb 'retrieves' means to get something back or recover it, which does not match the context of providing reminders.

Correct answer: yields

Explanation: The noun 'yields' fits grammatically as it refers to the amount produced, aligning with the context of increasing production. It is in the plural form, which is appropriate for the context of agricultural output.

Meaning: 'Yields' refers to the amount of product or profit produced, especially in agriculture, indicating the output from the cows.

Wrong options:

• fields: The noun 'fields' refers to areas of land, which does not relate to the concept of production or output in this context.
• infields: The term 'infields' is not commonly used in this context and does not convey a relevant meaning related to production.
• heralds: The verb 'heralds' means to announce or proclaim, which does not fit the context of measuring or increasing production.

Correct answer: converted

Explanation: The verb 'converted' is suitable as it indicates the process of changing milk into other products, fitting grammatically in the past participle form to describe the action taken on the milk. Contextually, it aligns with the process of transforming milk into cheese or yogurt.

Meaning: 'Converted' means to change something into a different form or use, in this case, changing milk into dairy products.

Wrong options:

• contracted: The verb 'contracted' means to enter into a formal agreement, which does not apply to the transformation of milk.
• combated: The verb 'combated' means to fight against something, which is irrelevant in the context of processing milk.
• constrained: The verb 'constrained' means to limit or restrict, which does not fit the context of changing milk into products.