Meaning: 'Exposing' means making something visible or uncovering it, in this case, new evidence of fossils.

Wrong options:

• demonstrating: The word 'demonstrating' is a present participle that implies showing or proving something, which does not fit the context of erosion revealing evidence.
• appearing: The word 'appearing' suggests something becoming visible but does not convey the active process of erosion revealing evidence, making it contextually inappropriate.
• confirmed: The word 'confirmed' is a past participle that indicates something has been verified, which does not fit the grammatical structure needed here.
• found: The word 'found' is a past participle that indicates discovery but does not convey the ongoing action of erosion, making it unsuitable in this context.

Correct answer: filled

Explanation: The term 'filled' is a past participle that describes the state of the Forest in the past, indicating it was once populated with trees and creatures. This fits grammatically and contextually, as it describes a condition that existed previously.

Meaning: 'Filled' means to be occupied or populated with something, in this case, trees and creatures.

Wrong options:

• demonstrating: The word 'demonstrating' does not fit as it implies showing or proving, which does not describe the state of the Forest.
• appearing: The word 'appearing' suggests visibility but does not convey the idea of being populated, making it contextually inappropriate.
• confirmed: The word 'confirmed' is a past participle that indicates verification, which does not fit the context of describing the Forest's past state.
• found: The word 'found' is a past participle that indicates discovery but does not describe the condition of being populated.

Correct answer: indicating

Explanation: The word 'indicating' is a present participle that fits grammatically and contextually, as it describes evidence that points to the existence of ancient native people. It maintains the flow of the sentence by linking evidence to its implications.

Meaning: 'Indicating' means showing or pointing out something, in this case, the presence of ancient native people.

Wrong options:

• demonstrating: The word 'demonstrating' implies showing or proving, which does not fit the context of evidence pointing to something.
• appearing: The word 'appearing' suggests becoming visible but does not convey the action of evidence pointing to past inhabitants, making it unsuitable.
• confirmed: The word 'confirmed' is a past participle that indicates verification, which does not fit the context of evidence indicating something.
• found: The word 'found' is a past participle that indicates discovery but does not convey the action of evidence pointing to ancient people.

Correct answer: confirmed

Explanation: The word 'confirmed' is a past participle that fits grammatically as it indicates that the evidence has been verified by archeologists. This aligns with the context of the sentence, which discusses the validation of findings.

Meaning: 'Confirmed' means to verify or establish the truth of something, in this case, the evidence of ancient native people.

Wrong options:

• demonstrating: The word 'demonstrating' implies showing or proving, which does not fit the context of evidence being verified.
• appearing: The word 'appearing' suggests becoming visible but does not convey the idea of verification, making it contextually inappropriate.
• indicating: The word 'indicating' is a present participle that suggests showing or pointing out, which does not fit the context of confirming evidence.
• found: The word 'found' is a past participle that indicates discovery but does not convey the action of verification needed in this context.