What were both nobles and knights obligated to do? A. remain loyal to one another
B. protect those who lived on the manor
C. take an oath of chivalry
D. provide personal and military service to the king

Provide personal and military service to the king

Explanation:

In feudalism land donations and titles were presented in as a present for support and army service. Several nobles were considered to serve as knights, whereas more nobles were considered to preserve military authorities. Under the nobles, knights were placed and below them were the peasants.Kings preferred loyalty to the nobles and aristocrats were designated for the responsibility of the king's assurance, and farmers used to assist with the food.

salt is a type of solid, which means that it will when placed in water.

  a.  

soluble, float

  b.  

soluble, dissolve

  c.  

insoluble, settle

  d.  

insoluble, dissolve

first paragraph (and busy all the night ,with a silence deep and white )