Meaning: Awareness refers to the knowledge or perception of a situation or fact, in this case, the issue of plastic pollution.

Wrong options:

• recent: The word 'recent' is an adjective that describes time and does not fit as a subject in this context.
• straight: The word 'straight' is an adjective that does not relate to the concept of public understanding or concern.
• fact: The word 'fact' is a noun that does not fit grammatically as it does not serve as a subject in this context.
• neither: The word 'neither' is a conjunction that indicates a negative choice and does not fit the context of raising awareness.
• stress: The word 'stress' is a noun that refers to pressure or strain, which does not fit as a subject here.

Correct answer: stress

Explanation: The word 'stress' fits grammatically as a noun that describes the negative impact of plastic pollution on marine creatures. It is contextually appropriate as it highlights the harm caused by plastic waste.

Meaning: Stress refers to mental or emotional strain, in this case, the distress experienced by marine life due to plastic pollution.

Wrong options:

• recent: The word 'recent' is an adjective that does not describe a type of harm or impact, making it unsuitable here.
• awareness: The word 'awareness' does not fit as it refers to knowledge rather than a type of harm.
• straight: The word 'straight' is an adjective that does not relate to the context of harm or stress.
• fact: The word 'fact' is a noun that does not convey the emotional or physical impact on marine creatures.
• neither: The word 'neither' is a conjunction that does not fit in the context of describing harm.

Correct answer: recent

Explanation: The word 'recent' fits grammatically as an adjective that describes the noun 'study.' It is contextually relevant as it indicates that the study was conducted not long ago, which is important for the timeliness of the findings.

Meaning: Recent refers to something that has happened or been done not long ago, in this case, a study on plastic pollution.

Wrong options:

• awareness: The word 'awareness' is a noun that does not describe the timing of a study and is therefore not suitable here.
• stress: The word 'stress' is a noun that does not fit as a descriptor for a study.
• straight: The word 'straight' is an adjective that does not relate to the context of time or studies.
• fact: The word 'fact' is a noun that does not provide information about the timing of the study.
• neither: The word 'neither' is a conjunction that does not fit in the context of describing a study.

Correct answer: affect

Explanation: The word 'affect' fits grammatically as a verb that describes the action of having an influence on something. It is contextually appropriate as it indicates the potential impact of plastic pollution on human health and food security.

Meaning: Affect means to have an influence on or make a change in something, in this case, human health and food security.

Wrong options:

• recent: The word 'recent' is an adjective that does not fit as a verb in this context.
• awareness: The word 'awareness' is a noun that does not convey an action and is therefore not suitable here.
• stress: The word 'stress' is a noun that does not fit as a verb and does not convey the intended action.
• fact: The word 'fact' is a noun that does not fit as a verb in this context.
• neither: The word 'neither' is a conjunction that does not fit as a verb and does not convey an action.