Meaning: 'Determined' means established or decided, indicating that the protein intake is set based on certain criteria.

Wrong options:

• suggested: 'Suggested' implies a recommendation rather than a definitive conclusion, which does not convey the same level of certainty as 'determined'.
• contracted: 'Contracted' refers to something that has been made smaller or reduced, which does not apply to the context of establishing protein intake.
• allocated: 'Allocated' means distributed or assigned, which does not accurately reflect the process of establishing protein needs based on factors.

Correct answer: equivalent

Explanation: The term 'equivalent' is appropriate here as it indicates that the recommended protein intake corresponds to a specific amount in another measurement. This fits both grammatically and contextually, as it clarifies the relationship between grams and body weight.

Meaning: 'Equivalent' means equal in value, amount, function, or meaning, showing that the protein intake per kilogram is comparable to a specific amount per pounds.

Wrong options:

• convenient: 'Convenient' suggests something that is easy to use or access, which does not relate to the measurement of protein intake.
• adjacent: 'Adjacent' means next to or adjoining something else, which does not fit the context of comparing protein amounts.
• tangible: 'Tangible' refers to something that can be touched or physically measured, which does not apply to the abstract concept of protein equivalence.

Correct answer: those who

Explanation: The phrase 'those who' is grammatically correct as it refers to a specific group of people engaging in intense workouts. It fits contextually as it introduces a clause that describes individuals with particular needs.

Meaning: 'Those who' refers to a specific group of people characterized by a certain action or condition, in this case, individuals who engage in intense workouts.

Wrong options:

• if them: 'If them' is grammatically incorrect as it does not properly introduce a clause and lacks clarity in referring to a group.
• that they: 'That they' is awkward and incorrect in this context, as it does not smoothly connect to the subject being described.
• they: 'They' alone lacks the necessary specificity and grammatical structure to introduce the clause about individuals engaging in workouts.

Correct answer: obtained

Explanation: The word 'obtained' is suitable as it indicates the process of acquiring protein from various sources. It fits grammatically and contextually, as it describes how protein can be sourced from both animal and plant origins.

Meaning: 'Obtained' means acquired or received, indicating the means through which protein is sourced.

Wrong options:

• disposed: 'Disposed' means to get rid of something, which is the opposite of acquiring protein and does not fit the context.
• surmised: 'Surmised' means to infer or guess, which does not relate to the concrete action of acquiring protein.
• inferred: 'Inferred' means to deduce or conclude information, which does not apply to the act of obtaining protein.

Correct answer: building

Explanation: The term 'building' is appropriate as it describes the fundamental components that make up protein. It fits grammatically and contextually, emphasizing the role of amino acids in constructing proteins.

Meaning: 'Building' refers to the process of constructing or forming, indicating that amino acids are the essential components that create proteins.

Wrong options:

• equipping: 'Equipping' implies providing with necessary items or tools, which does not accurately describe the role of amino acids in protein formation.
• cyclic: 'Cyclic' refers to something that occurs in cycles, which does not relate to the nature of amino acids as building blocks of protein.
• evident: 'Evident' means clear or obvious, which does not fit the context of describing the function of amino acids in protein.