Question

Brief information. Down's syndrome or Mongol disease​

Answer 1

Explanation:

A magnesium ribbon should be cleaned before burning in air because magnesium when exposed to air reacts with oxygen which leads to the formation of magnesium oxide on the surface of the magnesium ribbon.

Answer 2

Answer:

Explanation:

Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is usually associated with physical growth delays, mild to moderate intellectual disability, and characteristic facial features.