Meaning: 'Resembles' means to look like or be similar to something else.

Wrong options:

• there: 'There' is an adverb indicating a place or existence, which does not fit as it does not describe an action or comparison.
• developing: 'Developing' is a present participle that does not fit grammatically in this context, as it does not convey the intended meaning of similarity.
• rare: 'Rare' is an adjective that describes something uncommon, which does not relate to the action of looking like something else.
• controversial: 'Controversial' is an adjective that describes something likely to cause disagreement, which does not fit the context of describing resemblance.
• this: 'This' is a demonstrative pronoun that does not fit as it does not describe an action or comparison.

Correct answer: developed

Explanation: The term 'developed' is the past participle of the verb 'develop,' which fits grammatically as it describes the state of the sensory organ. It aligns with the context of describing the advanced nature of the platypus's ability.

Meaning: 'Developed' means to have grown or advanced to a certain state or level.

Wrong options:

• there: 'There' is an adverb indicating a place or existence, which does not fit as it does not describe a state of being or ability.
• developing: 'Developing' is a present participle that does not fit grammatically in this context, as it does not convey the completed state of the sensory organ.
• rare: 'Rare' is an adjective that describes something uncommon, which does not relate to the advanced nature of the sensory organ.
• controversial: 'Controversial' is an adjective that describes something likely to cause disagreement, which does not fit the context of describing development.
• this: 'This' is a demonstrative pronoun that does not fit as it does not describe a state of being or ability.

Correct answer: there

Explanation: The word 'there' is an adverb that indicates the existence of something, fitting grammatically in this context as it introduces the location of the webbed feet. It aligns with the overall description of the platypus's physical features.

Meaning: 'There' refers to a place or existence, indicating the presence of the webbed feet.

Wrong options:

• developed: 'Developed' is a past participle that does not fit grammatically as it does not indicate a location or existence.
• hardly: 'Hardly' is an adverb that means barely or not at all, which does not fit as it does not indicate a location or existence.
• developing: 'Developing' is a present participle that does not fit grammatically in this context, as it does not convey a sense of place.
• rare: 'Rare' is an adjective that describes something uncommon, which does not relate to indicating existence.
• controversial: 'Controversial' is an adjective that describes something likely to cause disagreement, which does not fit the context of indicating existence.

Correct answer: hardly

Explanation: The word 'hardly' is an adverb that fits grammatically as it modifies the verb 'used,' indicating the extent to which the back feet are utilized. It aligns with the context of describing minimal usage.

Meaning: 'Hardly' means barely or not at all, indicating a very low degree of usage.

Wrong options:

• there: 'There' is an adverb indicating a place or existence, which does not fit as it does not describe the extent of usage.
• developed: 'Developed' is a past participle that does not fit grammatically as it does not convey the extent of usage.
• developing: 'Developing' is a present participle that does not fit grammatically in this context, as it does not convey the extent of usage.
• rare: 'Rare' is an adjective that describes something uncommon, which does not relate to the extent of usage.
• controversial: 'Controversial' is an adjective that describes something likely to cause disagreement, which does not fit the context of describing usage.