Explanation

AIDS stands for Acquired Immunodeficiency Syndrome.

It is caused by the HIV virus.

The virus primarily attacks the immune system.

This weakens the body's defense against infections and diseases.

Explanation

The human hand has 27 bones:

the carpals or wrist accounts for 8

the metacarpals or palm contain five

the remaining fourteen are digital bones; fingers and thumb.

while 

The number of bones in a human skull is 22

300 bones are there in a newly born infant.

Explanation

Goiter is caused by iodine deficiency.

It results in an enlarged thyroid gland.

Iodine deficiency can cause mental retardation in children.

Particularly if the deficiency occurs during fetal development or early childhood.

This is because iodine is essential for brain development and thyroid function.

The effects of the thyroid come from two iodine-containing hormones.

Explanation

Edward Jenner was a physician and scientist who pioneered the concept of vaccines including creating the smallpox vaccine, the world's first ever vaccine.

He belonged to the British.

Explanation

Typhoid and Cholera are both waterborne diseases that can be caused by drinking contaminated water.

• Typhoid fever is a bacterial infection caused by Salmonella Typhi, which can be spread through contaminated food and water.
• Cholera is a diarrheal disease caused by Vibrio cholerae, which can be spread through contaminated food and water, as well as through person-to-person contact.