Meaning: 'Can be' means that something is possible or able to happen, indicating that the existence of over two hundred species is a possibility in the rainforest.

Wrong options:

• have: The word 'have' implies possession, which does not fit the context of indicating the existence of species in the rainforest.
• has: 'Has' is a singular form that does not agree with the plural subject 'species,' making it grammatically incorrect in this context.
• is: The word 'is' suggests a state of being, which does not convey the potential existence of species as effectively as 'can be' does.

Correct answer: known

Explanation: The word 'known' is the past participle form of the verb 'know,' which is used here to describe the species that are recognized by science. This fits grammatically as it follows the verb 'are' implied in the sentence structure, indicating a state of being recognized.

Meaning: 'Known' means recognized or identified, indicating that these species have been acknowledged by the scientific community.

Wrong options:

• knowing: 'Knowing' is a present participle that does not fit the grammatical structure needed here, as it suggests an ongoing action rather than a state of recognition.
• knew: 'Knew' is the past tense form of 'know,' which does not fit the context of describing species that are currently recognized.
• know: 'Know' is the base form of the verb, which does not fit grammatically in this context where a past participle is required.

Correct answer: contains

Explanation: The verb 'contains' is in the present tense and agrees with the plural subject 'species,' indicating that these species currently have benefits for people. This fits grammatically and contextually within the sentence structure.

Meaning: 'Contains' means to have something within, indicating that the species hold benefits for people.

Wrong options:

• contain: 'Contain' is the base form of the verb and does not fit grammatically in this context where a present tense form is required.
• contained: 'Contained' is the past tense form, which does not accurately describe the current state of the species having benefits.
• containing: 'Containing' is a present participle that does not fit the grammatical structure needed here, as it suggests an ongoing action rather than a definitive statement.

Correct answer: complexity

Explanation: The word 'complexity' refers to the state of being intricate or complicated, which fits well in the context of biodiversity. It aligns grammatically as a noun that describes the high level of biodiversity in Malaysia.

Meaning: 'Complexity' means the quality of being intricate or complicated, indicating the rich and varied nature of biodiversity in Malaysia.

Wrong options:

• condensation: 'Condensation' refers to the process of becoming denser or more concentrated, which does not relate to biodiversity in this context.
• conjunction: 'Conjunction' refers to a word that connects clauses or sentences, which is unrelated to the topic of biodiversity.
• continuity: 'Continuity' refers to the unbroken and consistent existence of something, which does not accurately describe the nature of biodiversity as effectively as 'complexity' does.