Questions

China blocked wikipedia in all languages recently in May 2019.

Salts and sugars work to preserve foods by creating a Hypertonic environment.

Romans (753 BC - AD 410) began public health and sanitation systems.

Romans established the first public health and sanitation systems by building sewers and aqueducts.

They also treated diseases with diet, exercise and meditation.

The required number is SEVEN.

If you remove  S, it becomes EVEN.

Any moving object can exhibit kinetic energy, as kinetic energy is also known as Motional energy.

In the given options, only a space station orbiting Earth is in motion and all the other are in rest position.

Hence, option C) a space station orbiting Earth is only exhibiting kinetic energy.

The statements true about viruses are :

1. The capsid enters the host cell if the virus is enveloped.

2. Enveloped viruses bud from the host cell. 

3. HIV contains reverse transcriptase.

4. A retrovirus contains RNA.

Allows for expansion or contraction of the trachea. Hence, so large masses of food can pass through the esophagus during swallowing.