They were completely heterophic in nature because it allowed them to absorb different material from the environment as an energy source
Answer:
Due to its function to fight against disease.
Explanation:
Improvement of strength in the human body is very important because strong body helps in fighting against diseases. Strong body helps in doing physical activities and also helps in protecting itself from every type of harm. Weak human body can't fight against diseases due to weak immune system so we can conclude that improvement in human body is necessary for survival, development and health of human.
Option A because phloem is concerned with transport of prepared food materials(carbohydrates) from leaves to other plant parts ,so if it get damaged the plant naturally dies
