Which nutrient helps in building and repairing body tissues?

Here are the answers to the multiple-choice questions: Question 27: Which of the following careers mainly improves crop production? The correct answer is B. Agronomist. Question 28: When opposite poles of magnets are brought close, they The correct answer is B. attract. Question 29: The main function of the nucleus is to The correct answer is C. control activities. Question 30: When electrical energy changes into sound energy in a radio, some energy is also produced as The correct answer is C. heat. Question 31: Which nutrient helps in building and repairing body tissues? The correct answer is B. Proteins. Question 32: If friction suddenly disappeared on Earth, it would be difficult to The correct answer is B. walk. Question 33: A farmer notices stunted growth in crops despite enough water. The likely cause is The correct answer is B. lack of nutrients. Question 34: When a stone is thrown upward, it eventually falls because of The correct answer is C. gravity. Question 35: The relationship between science and industry is that science The correct answer is B. provides knowledge for inventions. Question 36: Anaemia causes a person to feel The correct answer is B. weak and tired. Question 37: A magnet loses strength when The correct answer is B. dropped repeatedly. Question 38: Which example shows kinetic energy? The correct answer is C. Moving train. Question 39: A child with swollen belly and thin limbs may be suffering from The correct answer is C. kwashiorkor. Question 40: In real life, Newton's First Law helps us understand why The correct answer is A. seat belts are important.