3.) Testing multiple variables.
        
                    
             
        
        
        
Kinetic energy. Kinetic energy is the motion of waves, electrons, atoms, molecules, substances, and objects. Chemical energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of chemical energy.
        
             
        
        
        
Answer:
Option 1,  Robotic arms used aboard the ISS are now used in delicate surgeries on Earth. 
Explanation:
The robotic arm on the international space station is used in conducting surgery. The first space robotic arm was launched in 2001 and its name was “Canadarm 2”. Though the aim of this arm was to construct space station but now a days it is used in imaging the surgical work area and instruments through its camera. The best feature of this hand is that it follows the instruction with high efficiency and precision level. 
Hence, option 1 is correct.
 
        
             
        
        
        
Answer:
Answer: Water rise to tall trees by suction pull during day it is low but during night time it is fast. during night time transpiration is fast and transpiration create a pressure also called transpirational pull which cause root water to move at leaves.
Explanation:
 
        
                    
             
        
        
        
The answer i think it changes