Answer:
e. equal numbers of protons and neutrons in the nucleus orbited by varying numbers of electrons
Explanation:
 
        
             
        
        
        
Answer:
7.5cm
Explanation:
Velocity vs Time Graph:
When the object is going along the plane with velocity v at a particular time interval t we can explain it's motion via the velocity vs time graph. If the velocity of the object is constant then velocity vs time graph will produce a horizontal straight line. If the amount of differentiation of velocity of the object is positive and constant then the graph shows the linear line whose slope is is the same as the ratio of the change in velocity to the time interval.
Velocity vs time graph:
Is shown in the attached image 
A velocity-time graph helps us to estimate the distance traveled by using the area under the graph.
Height of the triangle is the velocity (v) = 0.75m/s
 
The base of the triangle is the time interval (t) = 0.2sec
Distance travelled = Area of triangle
Distance travelled 
= 1/2(V) * t
 = 1/2(0.75m/s) * 0.2s
= 0.0075m
=7.5cm
Thus, during one beat blood flows  7.5 cm
 
        
             
        
        
        
Answer:To be considered a source of water pollution, the source must include a chemical. 
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Answer:   Rocks or sediments  carries these pieces of rock to a basin and deposits them in compaction cemenattion along
with organic matter
Explanation:
 
        
                    
             
        
        
        
Because the lung has two bronchi, it can still function if one bronchus is blocked by a foreign object. No gas exchange will happen to the affected side, and the other lung will compensate for the loss of air. The blocked portion though can become inflamed and can lead to infection and damage.