Meaning: 'Distinct' means clearly different or unique, indicating that no clearly defined genetic breaks were found among the northern spotted owls.

Wrong options:

• less: The word 'less' implies a smaller degree or amount, which does not fit the context of describing genetic breaks as it does not convey a clear differentiation.
• great: The word 'great' suggests a large extent or degree, which is not appropriate here as it does not describe the nature of genetic breaks.
• aspired: The word 'aspired' refers to a desire or ambition, which is irrelevant in this context as it does not relate to the genetic breaks being discussed.

Correct answer: several

Explanation: The word 'several' appropriately quantifies the landscape features, indicating that more than a few but not many were important in structuring genetic variation. This fits well grammatically and contextually within the sentence.

Meaning: 'Several' means more than two but not many, suggesting that multiple landscape features played a role in the genetic structure of the owls.

Wrong options:

• big: The word 'big' describes size rather than quantity, making it unsuitable for indicating the number of landscape features.
• stated: The word 'stated' refers to something that has been declared or mentioned, which does not fit the context of quantifying landscape features.
• rated: The word 'rated' implies a judgment or evaluation, which is not relevant in this context as it does not pertain to the number of features.

Correct answer: facilitated

Explanation: The word 'facilitated' fits grammatically as it indicates that the lower Oregon Coast Range helped or made it easier for gene flow to occur. This aligns with the context of discussing how certain features affect genetic movement.

Meaning: 'Facilitated' means to make an action or process easier, indicating that the lower Oregon Coast Range supported gene flow among the owls.

Wrong options:

• related: The word 'related' implies a connection or association, which does not convey the action of promoting or aiding gene flow.
• actual: The word 'actual' refers to something real or existing, which does not fit the context of describing the role of the landscape in gene flow.
• stapled: The word 'stapled' refers to fastening or securing, which is irrelevant in this context as it does not relate to the facilitation of gene flow.

Correct answer: suggesting

Explanation: The word 'suggesting' fits grammatically as it indicates that the Columbia River implies or indicates a certain behavior of the owls regarding their ability to fly over it. This aligns well with the context of discussing the river's role as a barrier.

Meaning: 'Suggesting' means to imply or indicate, indicating that the owls' behavior shows they can easily cross the river.

Wrong options:

• repeating: The word 'repeating' implies doing something again, which does not fit the context of indicating the owls' behavior regarding the river.
• bringing: The word 'bringing' suggests carrying or leading to a place, which does not appropriately describe the relationship between the river and the owls' flight behavior.
• staring: The word 'staring' refers to looking fixedly, which is irrelevant in this context and does not relate to the owls' ability to fly over the river.