The answer is that "it is reinforced based on a <span>fixed-interval schedule".
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A Fixed Interval Schedule gives a reward at reliable circumstances. For example a kid might be rewarded once per week if their room is tidied up. A problem with this sort of fortification timetable is that people tend to hold up until the point that the time when support will happen and then begin their reactions. Due to this reinforcement, yield doesn't stay steady.  For example, Educator plans exams or undertakings at general interims and the grade is the reinforced, yet the work is inconsistent during the interim between tests.
        
             
        
        
        
<span>Indigo, rice, and tobacco are three important crops from that period. Indigo was used for dye, easy to grow but hard to harvest; rice is always an important staple crop and was grown in the swampy waters near the coast; tobacco is also a very profitable crop.</span>
        
             
        
        
        
Answer:
countries like the U.S. and England  trace their culture roots to Greece.
Explanation:
A lot of cultural values that currently held by western civilizations was originated from ancient Greece. They were the first people that first introduced the concept of Democracy which gave the people with the power to influence the government.
The spread of Greece's cultural value was accelerated with the help of Roman empire. After learning the cultural values from the Greek , People from Rome managed to conquered the vast majority of Europe. They spread the culture to the conquered area throughout the process. Since US was colonized by European countries, the culture got spread in north American territory too.
 
        
             
        
        
        
Explanation:
the measures of fertility are .
- crude birth rate.
 
CBR= B/P×1000
2.Age specific fertility rate .
ASFR= B/P×1000
3.total fertility rate.
TFR=£ASFR×5/1000 
£ sign means sametion 
hope it is helpful to you