Meaning: 'Considerably' means to a great extent or degree.

Wrong options:

• expectedly: Expectedly is an adverb that implies something is anticipated, which does not convey the significant difference in commonality required in this context.
• exceedingly: Exceedingly is an adverb that means extremely, but it does not fit the comparative structure of 'more common' as effectively as 'considerably.'
• exposure: Exposure is a noun that does not grammatically fit in this blank, as it does not modify 'more common.'
• ramped: Ramped is an adjective that suggests an increase but does not fit the context of describing commonality in fossils.
• impossibility: Impossibility is a noun that does not relate to the comparative nature of the statement about commonality.
• pressure: Pressure is a noun that does not fit grammatically in this context, as it does not modify 'more common.'
• impression: Impression is a noun that does not relate to the degree of commonality and does not fit grammatically.

Correct answer: exposure

Explanation: The term 'exposure' is a noun that refers to the condition of being exposed to oxygen, which is crucial in the context of fossil formation. It fits grammatically as the subject of the clause and aligns with the context of decay due to oxygen.

Meaning: 'Exposure' refers to the state of being exposed to something, in this case, oxygen.

Wrong options:

• considerably: Considerably is an adverb that does not fit grammatically as it cannot serve as a subject in this context.
• expectedly: Expectedly is an adverb that does not relate to the subject of decay and does not fit grammatically.
• ramped: Ramped is an adjective that does not fit the context of discussing the condition of being exposed.
• impossibility: Impossibility is a noun that does not relate to the action of being exposed and does not fit grammatically.
• exceedingly: Exceedingly is an adverb that does not serve as a subject and does not fit in this context.
• pressure: Pressure is a noun that does not relate to the condition of exposure and does not fit grammatically.
• impression: Impression is a noun that does not relate to the context of decay due to exposure.

Correct answer: impossibility

Explanation: The word 'impossibility' is a noun that describes the state of being impossible, which fits the context of fossil formation being hindered by decay. It aligns grammatically as the subject of the clause and logically follows from the previous statement about exposure to oxygen.

Meaning: 'Impossibility' refers to the state of being impossible or not able to occur.

Wrong options:

• considerably: Considerably is an adverb that does not fit grammatically as it cannot serve as a subject in this context.
• expectedly: Expectedly is an adverb that does not relate to the state of fossil formation and does not fit grammatically.
• exceedingly: Exceedingly is an adverb that does not serve as a subject and does not fit in this context.
• exposure: Exposure is a noun that does not relate to the impossibility of fossil formation and does not fit grammatically.
• pressure: Pressure is a noun that does not relate to the state of being impossible and does not fit in this context.
• ramped: Ramped is an adjective that does not fit the context of describing the state of fossil formation.
• impression: Impression is a noun that does not relate to the impossibility of fossil formation and does not fit grammatically.

Correct answer: exceedingly

Explanation: The term 'exceedingly' is an adverb that modifies 'long period of time,' indicating a very high degree of duration. This fits grammatically and contextually, as it emphasizes the extensive time required for the process described.

Meaning: 'Exceedingly' means to a very great degree or extremely.

Wrong options:

• considerably: Considerably is an adverb that indicates a significant degree but does not convey the extreme nature of the time period as effectively as 'exceedingly.'
• expectedly: Expectedly is an adverb that implies anticipation, which does not fit the context of describing duration.
• exposure: Exposure is a noun that does not fit grammatically as it cannot modify 'long period of time.'
• impossibility: Impossibility is a noun that does not relate to the duration of time and does not fit grammatically.
• pressure: Pressure is a noun that does not fit in this context as it does not modify 'long period of time.'
• ramped: Ramped is an adjective that does not fit the context of describing the extent of time.
• impression: Impression is a noun that does not relate to the duration of time and does not fit grammatically.

Correct answer: pressure

Explanation: The word 'pressure' is a noun that refers to the force exerted by the layers of mud or sand on the dead organism. It fits grammatically as the subject of the clause and logically follows from the context of fossil formation.

Meaning: 'Pressure' refers to the force applied to something, in this case, the layers of sediment on the organism.

Wrong options:

• considerably: Considerably is an adverb that does not fit grammatically as it cannot serve as a subject in this context.
• expectedly: Expectedly is an adverb that does not relate to the force applied by layers of sediment and does not fit grammatically.
• exceedingly: Exceedingly is an adverb that does not serve as a subject and does not fit in this context.
• impossibility: Impossibility is a noun that does not relate to the force of pressure and does not fit grammatically.
• ramped: Ramped is an adjective that does not fit the context of describing the force applied by layers of sediment.
• impression: Impression is a noun that does not relate to the concept of pressure and does not fit grammatically.