Bightness constancy refers to the fact that: a. light waves reflected by an object remain constant despite changes in illumination levels.
b. one of the depth cues involves perceiving dimmer objects as being farther away.
c. the frequency of light waves has a fixed relationship to the brightness of the light.
d. the perceived whiteness of an object has a constant relation to its lightness.
e. objects are perceived to have consistent lightness even if the amount of light they reflect changes.

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.

yes i would go with c

hope i

-lavira: )

well, i can't read it so i'll ask you questions about it : )

if you were a reader and you read the introduction, would you want to read more?

does it start with a question? if so, is it something you would want to read about?

and ask any friends or family for their opinion : )

answer; in small towns;