A.I. Explanation:

Correct answer: fed

Explanation: The verb 'fed' is the correct choice as it indicates the action of providing data to a computer program, fitting grammatically in the past tense and contextually in the sentence about processing recordings. It aligns with the structure of the sentence, which describes how the recordings were handled.

Meaning: 'Fed' means to supply or provide something, in this case, the recordings to a computer program for analysis.

Wrong options:

• delivered: 'Delivered' implies a physical transfer of items, which does not fit the context of inputting data into a program.
• parcelled: 'Parcelled' suggests packaging items, which is not relevant to the context of data processing.
• pushed: 'Pushed' typically refers to a physical action and does not accurately describe the act of inputting data into a computer.

Correct answer: evidence

Explanation: The word 'evidence' is appropriate here as it refers to data or information that supports a claim, fitting grammatically and contextually with the sentence discussing findings from the experiment.

Meaning: 'Evidence' means information or facts that help to prove something, in this case, supporting the idea of a common ancestor among species.

Wrong options:

• grounds: 'Grounds' refers to reasons or basis for a belief, which does not fit as well in this context as it is less specific than 'evidence'.
• conclusions: 'Conclusions' implies final judgments or decisions based on evidence, but does not directly refer to the supporting data itself.
• testimonies: 'Testimonies' refers to statements made by witnesses, which is not relevant in the context of scientific findings.

Correct answer: evolved

Explanation: The verb 'evolved' is the correct choice as it is in the simple past tense, indicating a completed action that aligns with the context of discussing the development of laughter over time.

Meaning: 'Evolved' means to develop gradually, especially from a simple to a more complex form, which fits the context of primate laughter changing over time.

Wrong options:

• will evolve: 'Will evolve' suggests a future action, which does not match the context of discussing past changes in laughter.
• have been evolved: 'Have been evolved' is grammatically incorrect as it implies a passive voice that does not fit the intended meaning.
• were evolved: 'Were evolved' incorrectly suggests a passive construction that is not appropriate for this context.

Correct answer: from

Explanation: The preposition 'from' is the correct choice as it indicates the point of origin, fitting grammatically and contextually in the sentence about the split from a common ancestor.

Meaning: 'From' indicates the source or starting point of something, in this case, the common ancestor shared with chimps.

Wrong options:

• into: 'Into' suggests movement towards the inside of something, which does not fit the context of separation from a common ancestor.
• off: 'Off' implies a physical detachment, which is not the correct preposition to describe the evolutionary split.
• in: 'In' suggests being inside something, which does not accurately convey the idea of separation from a common ancestor.