Explanation:
Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).
 
        
             
        
        
        
Answer:
98 joules 
Explanation:
1/2 of 28 = 14 
14 multiply by 7= 98 joules 
 
        
             
        
        
        
Answer:
the weight of alien is 200 newtons 
Explanation:
The computation of the alien weight is shown below:
Given that 
Acceleration = 20m/sec^2
And, the mass is 10 kg
So, the weight of alien is 
= 20 × 10
= 200 newtons
hence, the weight of alien is 200 newtons 
 
        
             
        
        
        
The answer is A) specific chemical consumption 
 
        
                    
             
        
        
        
Explanation:
The newton's laws of motion are: 
First law: 
   "A body will remain in its state of rest or of uniform motion along a path unless it is acted upon by an external force. ". 
This is popularly called the law of inertia. 
Second law: 
  "the acceleration of a body is produced by a net force that is inversely proportional to the mass of the body". 
Third law: 
   "action and reaction forces are equal and opposite in direction".
learn more: 
Newton's laws brainly.com/question/11411375
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