What do cultural-historical archaeologists believe is the main reason why cultures adapt? O A. They respond to the influence of other cultures.
B. They respond to their changing environment.
OC. They learn from their ancestors' mistakes.
D.
They constantly find new resources to work with.

i'm sorry i don't know

step-by-step explanation:

i think the answer is b

it is a secret for it not to be compromised sorry

step-by-step explanation:

statement #3: proof- ang is congruent to ang ecd : angles are congruent.  

step-by-step explanation:

1: the missing angles in statement #3  

a.) acb  

reason- the reason why the answer is acb is because angle ecd and angle acb are both the same size *that's what the word congruent means this is really simple.  

2: the missing word in reason #3  

c.) vertical  

reason- the reason why the answer is vertical is because the angles in that diagram on figure 2 is slanted, which is vertical, and the e and a both lay on vertical lines. along with the other's, but e and a are the 2 main points you want to focus on. and c is kind of like your starting point, because c is for both angles, not just one.  

i hope that was and understanding.