What If All Viruses Vanished?

What role do viruses play in a healthy human mouth?

• Cause periodontal disease.

• Help keep oral microbes balanced.

• Increase the number of bacteria.

• Have no effect on oral health.

What is a significant impact of viruses in Earth's oceans?

• They increase the ocean's temperature.

• They kill marine bacteria, helping to cycle nutrients and carbon.

• They create new species of fish.

• They decrease the amount of oxygen in the water.

Approximately what percentage of the human genome is made up of viral sequences?

• Less than 1%

• Around 8%

• About 25%

• More than 50%

Which statement best describes the overall role of viruses in nature?

• All viruses are harmful pathogens that cause disease.

• Viruses are non-living entities with no impact on ecosystems.

• Viruses are an integral part of life on Earth, influencing ecosystems and evolution.

• Viruses only exist in humans and other mammals.