It is false that the mathematical system in Mesopotamia was based on the number 7. O.
<u>Explanation:</u>
The mathematical system is Mesopotamia was based on the number 60 at it's base and not on 7. This numeral system is known as sexagesimal which had 60 at it's base. 
This originated in the 3rd millennium BC and passed on to the ancient Babylonians and it is still used for measuring angles, times, geographic co ordinates. Since the statement that the mathematical system in Mesopotamia was based on number 7 is incorrect.
 
        
             
        
        
        
Answer and Explanation: Earth's climate has changed dramatically many times since the planet was formed 4.5 billion years ago. These changes have been triggered by the changing configuration of continents and oceans, changes in the Sun's intensity, variations in the orbit of Earth, and volcanic eruptions. Hope it helps!
        
             
        
        
        
It is a false statement that an occluded fronts is characterized as the beginning stages of a middle latitude cyclone.
<h3>What is a middle latitude cyclone?</h3>
It refers to the synoptic scale low pressure system that has cyclonic flow that is found in the middle latitudes in a counter-clockwise form in northern hemisphere.
Most time, what occurs during the occluded front phase of a middle latitude cyclone is that there is a dryness and coolness of the air that causing a dissipation of the system.
Therefore, It is a false statement that an occluded fronts is characterized as the beginning stages of a middle latitude cyclone.
Read more about latitude cyclone
brainly.com/question/2215965
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Answer:sand dunes
Explanation:
They are man made barriers, made of sand, to protect the coast from erosion from the incoming waves. They also help to control flooding from storm surge.
 
        
                    
             
        
        
        
Answer:
From clustered settlements.
Explanation:
Each person living in a clustered rural settlement is allocated strips of land in the surrounding fields. In other places the land is owned collectively by the settlement or by a lord, and farmers do not control the choice of crops or use of the output.