Explanation

The opposite of an integer is its additive inverse.

The opposite of -21 is +21.

Explanation

Spirogyra is an algae, whereas Mold, Yeast, and Rhizopus are fungi.

It performs photosynthesis, while fungi are decomposers.

Explanation

Carbohydrates provide quick and sustained energy, essential for endurance activities.

They help replenish glycogen stores, preventing fatigue during long-distance running.

Explanation

According to the World Health Organization (WHO), health is defined as a state of complete physical, mental, and social well-being, not just the absence of disease.

This holistic approach emphasizes overall wellness, including emotional and psychological aspects.

Explanation

To write 50700 in scientific notation, move the decimal point to the left until you have a number between 1 and 10:

50700 → 5.07 × 10⁴

Explanation

To find the percentage that 3% is of 5%, divide 3% by 5% and multiply by 100:

(3/5) × 100

= 0.6 × 100

= 60%

Explanation

"Broken down" means weakened or deteriorated, often due to stress or excessive work.

In this sentence, it indicates that his health has worsened because of hard work.

Explanation

Cholera "breaks out" means it spreads rapidly, especially after floods due to contaminated water.

Floods increase the risk of waterborne diseases like cholera.

Explanation

Proper posture, avoiding heavy lifting, and stretching exercises help prevent back pain and injury.

These practices reduce strain on the spine and improve flexibility and strength.

Explanation

Aristotle emphasized holistic education, believing that both physical and mental well-being are essential for learning.

His philosophy supported balanced development, combining intellectual, moral, and physical training for a well-rounded individual.